Determine path to ntpd init script using pattern

In different linux distros ntpd daemon init script
could be named as 'ntp' or 'ntpd', so we should use
pattern to determine the correct path.

Change-Id: Ie0341a72eaaa0ad80033b4680b06b03a1bc3e73e
Closes-bug: #1353455
Merge "Determine path to ntpd init script using pattern"