tests: Create a regression-tests package for distribution

As of today regression tests are an in-house breed, by making
it a new package and distributing it ensures larger set of
people use it and contribute to it. This can also be used
by any consumer/user to build their own environment for glusterfs
regression testing which is today limited only to 'upstream'
'glusterfs' releases and build.gluster.org

Change-Id: I4f7e9fd1c49982dcf0d788ef6a83ffe895a956ac
BUG: 764966
Signed-off-by: Harshavardhana <harsha@harshavardhana.net>
Reviewed-on: http://review.gluster.org/5674
Reviewed-by: Niels de Vos <ndevos@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>