Add NTP Sync

Adds ntp to the new VM and forces a full clock sync to avoid
any drift between Jenkins and ETSI VIM

Fixes bug 1775

Change-Id: I7cec55cdedcf53f6206ee54959dea4f8f1cfeb65
Signed-off-by: beierlm <mark.beierl@canonical.com>
(cherry picked from commit b59bd0db)