xci: Force sync time

xci: Force sync time

For some reason, when the nodes are provisioned, they are out
of sync time-wise. This prevents neutron agents on compute nodes
from starting and then everything fails.

This change restarts chrony after the network configuration is updated
and the nodes have internet access and force synchs time on nodes.

Change-Id: Ib27b1fa0313223b52fa2e6229d5a179581d62686
Signed-off-by: Fatih Degirmenci <fatih.degirmenci@ericsson.com>