[DMAAP-MR] Update RTD setup files

Signed-off-by: efiacor <fiachra.corcoran@est.tech>
Change-Id: I108c7940fe36a889287bf6b72a87942fee930411
Issue-ID: DMAAP-1824
diff --git a/.gitreview b/.gitreview
index c1492a9..23a16ba 100644
--- a/.gitreview
+++ b/.gitreview
@@ -2,3 +2,4 @@
 host=gerrit.onap.org
 port=29418
 project=dmaap/messagerouter/messageservice
+defaultbranch=master