Updating ntp.conf file in Contrail VM launched in the ESXi
Added changes for esx_ntp_server in testbed_multibox_example.py

Change-Id: Ibc74315c59efcc4d8fdd3052d63ed53dcfc948ad
Merge "Updating ntp.conf file in Contrail VM launched in the ESXi Added changes for esx_ntp_server in testbed_multibox_example.py"