Fixed lxc option parsing.

This fixes::

    Traceback (most recent call last):
      File "/home/jpic/.ansible/tmp/ansible-tmp-1435080916.98-133068627776311/lxc_container", line 3355, in <module>
        main()
      File "/home/jpic/.ansible/tmp/ansible-tmp-1435080916.98-133068627776311/lxc_container", line 1724, in main
        lxc_manage.run()
      File "/home/jpic/.ansible/tmp/ansible-tmp-1435080916.98-133068627776311/lxc_container", line 1605, in run
        action()
      File "/home/jpic/.ansible/tmp/ansible-tmp-1435080916.98-133068627776311/lxc_container", line 1145, in _started
        self._config()
      File "/home/jpic/.ansible/tmp/ansible-tmp-1435080916.98-133068627776311/lxc_container", line 714, in _config
        _, _value = option_line.split('=')
    ValueError: too many values to unpack

With such a task::

    tasks:
    - lxc_container:
        name: buildbot-master
        container_config:
        - "lxc.mount.entry = {{ cwd }} srv/peopletest none defaults,bind,uid=0,create=dir 0 0"

lib/ansible/modules/extras/cloud/lxc/lxc_container.py

@@ -708,7 +708,7 @@ class LxcContainerManagement(object):
             for option_line in container_config:
                 # Look for key in config
                 if option_line.startswith(key):
-                    _, _value = option_line.split('=')
+                    _, _value = option_line.split('=', 1)
                     config_value = ' '.join(_value.split())
                     line_index = container_config.index(option_line)
                     # If the sanitized values don't match replace them