Description of problem:
Performing host network changes or querying during changes in parallel may result in either corruption of the configuration or in presenting a state of the host in a intermediate unstable changing state.
Although the caller is expected to protect against such access, it is the responsibility of VDSM networking API to protect itself, providing a safe way to set or get the host network configuration.
Host network state changes and queries verbs should be in sync, not allowing concurrent access.
It is suggested to softly block on these verbs.
Engine makes sure not to shoot a getCaps while setupNetwork is on the fly.
It is not a high priority to protect this also on Vdsm.