strip whitespace from key and value before inserting it into the config

before the following would produce four entries:

    container_config:
      - "lxc.network.flags=up"
      - "lxc.network.flags =up"
      - "lxc.network.flags= up"
      - "lxc.network.flags = up"

let's strip the whitespace and insert only one "lxc.network.flags = up"
into the final config

Signed-off-by: Evgeni Golov <evgeni@golov.de>

cloud/lxc/lxc_container.py

@@ -745,6 +745,8 @@ class LxcContainerManagement(object):
 
         config_change = False
         for key, value in parsed_options:
+            key = key.strip()
+            value = value.strip()
             new_entry = '%s = %s\n' % (key, value)
             for option_line in container_config:
                 # Look for key in config