engine: Imroving updates of vds dynamic

The following patch is removing call for UpdateVdsDynamicData command in order to
update net_config_dirty field.

The change is make a simple update instead of:
1. Run query for VdsDynamic
2. Acquire lock on VdsManager
3. Perform update

Change-Id: Ic9e76b6ddd20ebd36a00d68b44da3a3a954ad87d
Signed-off-by: Michael Kublin <mkublin@redhat.com>