[fix] Update ZeroTier default name from 'ow_zt' to 'global'

The configuration format has changed on OpenWrt since ZeroTier
1.14.0. Previously, it supported running multiple services of the
ZeroTier controller, but now only one service is allowed called
"global".

Hence, the default name is changed from "ow_zt" to "global".

Author: pandafy

docs/source/backends/zerotier.rst

@@ -300,7 +300,7 @@ Required properties:
 ==================== ======= ========================== =========================
 key name             type    default                    description
 ==================== ======= ========================== =========================
-``name``             string  ``ow_zt``                  name of the zerotier
+``name``             string  ``global``                 name of the zerotier
                                                         network
 ``networks``         list    ``[{}]``                   list of dictionaries
                                                         containing strings with
@@ -363,7 +363,7 @@ Example (with custom zerotier interface name):
     from netjsonconfig import OpenWrt
 
     client_config = OpenWrt.zerotier_auto_client(
-        name="ow_zt",
+        name="global",
         networks=[{"id": "9536600adf654321", "ifname": "owzt654321"}],
     )
     print(OpenWrt(client_config).render())
@@ -374,13 +374,16 @@ Will be rendered as:
 
     package zerotier
 
-    config zerotier 'ow_zt'
+    config zerotier 'global'
         option config_path '/etc/openwisp/zerotier'
         option copy_config_path '1'
         option enabled '1'
         list join '9536600adf654321'
         option secret '{{secret}}'
 
+    config network 'owzt654321'
+        option id '9536600adf654321'
+
     # ---------- files ---------- #
 
     # path: /etc/openwisp/zerotier/devicemap
@@ -446,7 +449,7 @@ Now add ``local_conf_path`` option to ``/etc/config/zerotier``:
 
     package zerotier
 
-    config zerotier 'ow_zt'
+    config zerotier 'global'
         option enabled '1'
         list join '9536600adf654322'
         option secret '{{secret}}'

netjsonconfig/backends/zerotier/zerotier.py

@@ -17,7 +17,7 @@ class ZeroTier(BaseVpnBackend):
     @classmethod
     def auto_client(
         cls,
-        name='ow_zt',
+        name='global',
         networks=None,
         identity_secret='{{secret}}',
         config_path='/etc/openwisp/zerotier',

tests/openwrt/test_backend.py

@@ -548,7 +548,7 @@ def test_zerotier_auto_client(self):
             expected = {
                 'zerotier': [
                     {
-                        'name': 'ow_zt',
+                        'name': 'global',
                         'networks': [],
                         'secret': '{{secret}}',
                         'config_path': '/etc/openwisp/zerotier',
@@ -561,7 +561,7 @@ def test_zerotier_auto_client(self):
             expected = {
                 'zerotier': [
                     {
-                        'name': 'ow_zt',
+                        'name': 'global',
                         'networks': [
                             {'id': '9536600adf654321', 'ifname': 'owzt654321'}
                         ],

tests/openwrt/test_zerotier.py

@@ -12,7 +12,7 @@ class TestZeroTier(unittest.TestCase, _TabsMixin):
         "zerotier": [
             {
                 "local_conf_path": "/etc/openwisp/zerotier/zerotier.conf",
-                "name": "ow_zt",
+                "name": "global",
                 "networks": [
                     {
                         "id": "9536600adf654321",
@@ -36,7 +36,7 @@ class TestZeroTier(unittest.TestCase, _TabsMixin):
     }
     _multiple_networks_uci = """package zerotier
 
-config zerotier 'ow_zt'
+config zerotier 'global'
     option config_path '/etc/openwisp/zerotier'
     option copy_config_path '1'
     option enabled '1'
@@ -77,11 +77,11 @@ class TestZeroTier(unittest.TestCase, _TabsMixin):
     _TEST_DIFF_NAME_MULTIPLE_CONFIG = {
         "zerotier": [
             {
-                "name": "ow_zt1",
+                "name": "global1",
                 "networks": [{"id": "9536600adf654321", "ifname": "owzt654321"}],
             },
             {
-                "name": "ow_zt2",
+                "name": "global2",
                 "networks": [{"id": "9536600adf654322", "ifname": "owzt654322"}],
             },
         ]
@@ -96,7 +96,7 @@ def test_zt_parse_old(self):
         native = self._tabs(
             """package zerotier
 
-config zerotier 'ow_zt'
+config zerotier 'global'
     option enabled '0'
     option local_conf '/etc/openwisp/zerotier/zerotier.conf'
     list join '9536600adf654321'
@@ -111,7 +111,7 @@ def test_zt_parse_old(self):
                         {"id": "9536600adf654321", "ifname": "owzt654321"},
                         {"id": "9536600adf654322", "ifname": "owzt654322"},
                     ],
-                    "name": "ow_zt",
+                    "name": "global",
                     "disabled": True,
                 },
             ]
@@ -123,7 +123,7 @@ def test_zt_parse_new(self):
         native = self._tabs(
             """package zerotier
 
-config zerotier 'ow_zt'
+config zerotier 'global'
     option enabled '0'
     option local_conf_path '/etc/openwisp/zerotier/zerotier.conf'
 
@@ -153,7 +153,7 @@ def test_zt_parse_new(self):
                             "allow_dns": False,
                         },
                     ],
-                    "name": "ow_zt",
+                    "name": "global",
                     "disabled": True,
                 },
             ]

tests/zerotier/test_backend.py

@@ -393,15 +393,15 @@ def test_auto_client(self):
         test_config = self._TEST_CONFIG["zerotier"][0]
         nw_id = test_config['id']
         expected = {
-            'name': 'ow_zt',
+            'name': 'global',
             'networks': [{'id': '9536600adf654321', 'ifname': 'owzt654321'}],
             'secret': 'test_secret',
             'config_path': '/etc/openwisp/zerotier',
             'disabled': False,
         }
         self.assertEqual(
             ZeroTier.auto_client(
-                name="ow_zt",
+                name="global",
                 networks=[
                     {
                         'id': nw_id,