Added ability to recheck sahara CI by sahara-ci-recheck

Recheck will be triggered on both "recheck" and "sahara-ci-recheck"
commands. The second one will not trigger Jenkins recheck.

Change-Id: I004caa456a4972c3a2b61faf074dcdc0b26c6750
Merge "Added ability to recheck sahara CI by sahara-ci-recheck"