CBD-777: enable posting to litmus dashboard

vperf tests
reb tests
xdcr tests

Change-Id: I5b431060b0844eb097399d12886b0a67f9c3d3d7
Reviewed-on: http://review.couchbase.org/24203
Reviewed-by: Pavel Paulau <pavel.paulau@gmail.com>
Tested-by: Pavel Paulau <pavel.paulau@gmail.com>