Remove whitespace before comments

Python 2.7 ConfigParser does not accept whitespace before comments.
To keep config files produced by ansible-config_temple parsable
we will strip out the whitespace preceding comments.

Change-Id: I39c88578d0a9e42fded7410d7eb4ec8bd415550c
Related-Bug: #1755821

action/config_template.py

@@ -216,8 +216,8 @@ class ConfigTemplateParser(ConfigParser.RawConfigParser):
                     comments.append('')
                 continue
 
-            if line[0] in '#;':
-                comments.append(line)
+            if line.lstrip()[0] in '#;':
+                comments.append(line.lstrip())
                 continue
 
             if line.split(None, 1)[0].lower() == 'rem' and line[0] in "rR":

tests/templates/test_with_comments.ini

@@ -1,3 +1,4 @@
+ # This comment tests bug 1755821
 # A default section comment
 # broken into multiple lines
 [DEFAULT]

tests/test-common-tasks.yml

@@ -203,6 +203,8 @@
     that:
       - "(lookup('ini', 'new_key section=DEFAULT file=/tmp/test_with_comments.ini')) == 'new_value'"
       - "(lookup('ini', 'baz section=foo file=/tmp/test_with_comments.ini')) == 'bar'"
+      - "{{ ini_file.content | b64decode | search('# This comment tests bug 1755821')}}"
+      - "{{ not(ini_file.content | b64decode | search(' # This comment tests bug 1755821'))}}"
       - "{{ ini_file.content | b64decode | search('#This is a comment')}}"
       - "{{ ini_file.content | b64decode | search('# A default section comment\n# broken into multiple lines\n\\[DEFAULT\\]')}}"