Fix interactive console output

The interactive console output command was returning one line less
for each update. This was probably caused by Jenkins returning an
extra newline at the end of each console output.

This commit fixes this by replacing str.split by str.splitlines
function.

Note the difference between these two functions:

>>> '\na\nb\nc\n'.split('\n')
['', 'a', 'b', 'c', '']

>>> '\na\nb\nc\n'.splitlines()
['', 'a', 'b', 'c']

Author: radomirbosak

jenkins_cli/cli.py

@@ -294,7 +294,7 @@ def console(self, args):
             print("Cannot show console output. %(job_name)s has no builds" % {'job_name': job_name})
         else:
             console_out = self.jenkins.get_build_console_output(job_name, build_number)
-            console_out = console_out.split('\n')
+            console_out = console_out.splitlines()
             last_line_num = len(console_out)
             if args.n:
                 console_out = console_out[args.n:] if args.n < 0 else console_out[:args.n]
@@ -303,7 +303,7 @@ def console(self, args):
                 build_info = self.jenkins.get_build_info(job_name, build_number)
                 while build_info['building']:
                     console_out = self.jenkins.get_build_console_output(job_name, build_number)
-                    console_out = console_out.split('\n')
+                    console_out = console_out.splitlines()
                     new_line_num = len(console_out)
                     if new_line_num > last_line_num:
                         print("\n".join(console_out[last_line_num:]))