Fix writing of keys without values

Sometimes there might be a key in configfile, that should be empty but
defined correctly. This patch fixes such behaviour and adds testing.

Change-Id: I693bc3a2aade7015d0465583001962df4ba53443

action/config_template.py

@@ -220,8 +220,11 @@ class ConfigTemplateParser(ConfigParser.RawConfigParser):
 
     def _write_check(self, fp, key, value, section=False):
         def _return_entry(option, item):
-            if item:
+            # If we have item, we consider it as a config parameter with value
+            if item is not None:
                 return "%s = %s\n" % (option, str(item).replace('\n', '\n\t'))
+            elif not option:
+                return option
             else:
                 return "%s\n" % option
 

tests/files/test_comment_configs.ini.expected

@@ -1,44 +1,36 @@
 [DEFAULT]
-
 #
 # From nova.conf
 #
-
 #
 # Availability zone for internal services. For more information, refer to the
 # documentation. (string value)
 #internal_service_availability_zone = internal
-
 #
 # Default availability zone for compute services. For more information, refer to
 # the documentation. (string value)
 #default_availability_zone = nova
 default_availability_zone = zone1
-
 #
 # Default availability zone for instances. For more information, refer to the
 # documentation. (string value)
 #default_schedule_zone = <None>
-
 # Length of generated instance admin passwords (integer value)
 # Minimum value = 0
 #password_length = 12
 password_length = 100
-
 #
 # Time period to generate instance usages for. It is possible to define optional
 # offset to given period by appending @ character followed by a number defining
 # offset. For more information, refer to the documentation. (string value)
 #instance_usage_audit_period = month
 instance_usage_audit_period = blah blah blah
-
 test = test1,test2
 
 [SubSection]
 #Comments and overrides in a subsection
 #testopt1 = 9000
 testopt1 = 9000
-
 # This is another test opt
 #testop2 = over 9000
 

tests/files/test_default_section.ini.expected

@@ -1,9 +1,11 @@
 [global]
 test1 = 1
 # This is a post option comment
-
 test2 = 2
 
 [section1]
 setting1 = 1
-setting2 = 2
+setting2 = 2
+
+[section2]
+setting3 =

tests/files/test_remote_src_multistropts.ini.expected

@@ -3,10 +3,8 @@ test = test1
 test = test2
 test = test3
 
-
 [testsection]
 test = output
 
-
 [remote_src_section]
 test = output

tests/templates/test_default_section.ini

@@ -3,4 +3,7 @@ test1 = 1
 # This is a post option comment
 
 [section1]
-setting1 = 1
+setting1 = 1
+
+[section2]
+setting3 =