Per container save configuration is not synced in the cluster

Per container save configuration is not synced in the cluster

ISSUE: When container administrator saves the configuration on GUI,
       the configurations for the containers on which he has write permission
       are onlyu saved on the local controller.
CHANGE: Have ContainerConfigurationService manage its own event sync cache
        for this specific case. ContainerConfigurationService.saveConfigurations()
        gets invoked only when container adminidtrator trigger the save.For the
        save config triggered by system or network administrator, things work as
        today, it is handled by ConfigurationService which syncs the config event
        to the other ConfigurationServices in the cluster.

Change-Id: I961558579292fd10b0d8ee601aa64f3a3843b0ed
Signed-off-by: Alessandro Boch <aboch@cisco.com>