Move value_string termination check and OpenBSC headers checkout into
shared jenkins helper from BTS' model-specific helpers to get rid of
copy-pasted code. While at it - also remove unnecessary bash
dependency.
Change-Id: Ic48b1f75179b9008d65219dd5a47c1ab3b886408
spatch on Debian 8.0 has already crashed twice and is likely to
crash more and at the same time the value for this static checking
is close to zero (nice idea but never blossomed). So let's remove
it, have a more reliable build and let's coverity find those issues.
Change-Id: Ic1004edf7f0bee8dda30b95554a0aaf0b116b6b8