Add support for custom parameters

This adds support for custom parameters in bugzilla modify.
This needs to be given in form:
key1=val:key2=val:...

bugz/cli.py

@@ -513,6 +513,15 @@ def modify(settings):
         params['version'] = settings.version
     if hasattr(settings, 'whiteboard'):
         params['whiteboard'] = settings.whiteboard
+    if hasattr(settings, 'custom'):
+        custom_options = settings.custom.split(':')
+        for custom_option in custom_options:
+            try:
+                key,value = custom_option.split('=',1)
+                params[key] = value
+            except:
+                print("Badly formatted option :{}".format(custom_option))
+                pass
 
     if hasattr(settings, 'fixed'):
         params['status'] = 'RESOLVED'

bugz/cli_argparser.py

@@ -183,6 +183,8 @@ def make_arg_parser():
                                help='change the priority for this bug')
     modify_parser.add_argument('--product',
                                help='change the product for this bug')
+    modify_parser.add_argument('--custom',
+                               help='change custom parameters for this bug')
     modify_parser.add_argument('-r', '--resolution',
                                help='set new resolution '
                                '(if status = RESOLVED)')