Creating 1.8 support branch

- Updating .gitreview and Dockerfile

Change-Id: Ibaefc16974c13df0fb94f2c4eb4cc02b779d382f
diff --git a/.gitreview b/.gitreview
index 328aec6..44a6e0e 100644
--- a/.gitreview
+++ b/.gitreview
@@ -3,4 +3,4 @@
 port=29418
 project=onos.git
 defaultremote=origin
-defaultbranch=master
+defaultbranch=onos-1.8
diff --git a/tools/build/docker/Dockerfile b/tools/build/docker/Dockerfile
index 6bcae28..f273c14 100644
--- a/tools/build/docker/Dockerfile
+++ b/tools/build/docker/Dockerfile
@@ -22,7 +22,7 @@
 WORKDIR /src
 RUN     apt-get update && apt-get install -y python git less zip curl oracle-java8-installer oracle-java8-set-default && \
         git clone https://github.com/opennetworkinglab/onos.git && \
-        cd onos && \
+        cd onos && git checkout onos-1.8 && \
         tools/build/onos-buck build onos && \
         cp buck-out/gen/tools/package/onos-package/onos.tar.gz /tmp/ && \
         cd .. && \