do not install jenkins-cli on tox run

LD250 · LD250 · commit 314877c4199f · 2016-04-30T14:55:11.000+03:00
diff --git a/tox.ini b/tox.ini
@@ -5,6 +5,7 @@
 
 [tox]
 envlist = py27, py34
+skipsdist = True
 
 [testenv]
 commands =
