Closes-Bug :# 1319008
--Check for presense of contrail-version script before using it.
--Send rpm-version and build-id as 'unknown' if contrail-version script does not exist

Change-Id: Idecfdb5a2eec6f6bf8c4dd4bcdb5b5c092b64195
Merge "Closes-Bug :# 1319008 --Check for presense of contrail-version script before using it. --Send rpm-version and build-id as 'unknown' if contrail-version script does not exist"