Create release test suite in test/regression/release folder
to run release tests after each release is created. We run this
for every job and look for the IS_RELEASE condition. If the
condition satisfies, job executes all release tests otherwise will
skip tests.

Will run this job in silent mode and disable gerrit
voting.

Instructions to run this patch:

clone fabric repo
cd test/regression/release
./runReleaseTestSuite.sh

Change-Id: If45bcdeee4f5ecb28df405815718fe6a8ee2b583
Signed-off-by: rameshthoomu <rameshbabu.thoomu@gmail.com>