Updated opdemand/buildstep build procedure.

Author: mboersma

contrib/ec2/prepare-ubuntu-ami.sh

@@ -33,6 +33,7 @@ apt-get install lxc-docker curl git make python-setuptools python-pip -yq
 # create buildstep docker image
 git clone -b deis https://github.com/opdemand/buildstep.git
 cd buildstep
+git checkout deis
 make
 cd ..
 rm -rf buildstep

contrib/rackspace/prepare-rackspace-image.sh

@@ -34,6 +34,7 @@ apt-get install lxc-docker curl git make python-setuptools python-pip -yq
 # create buildstep docker image
 git clone -b deis https://github.com/opdemand/buildstep.git
 cd buildstep
+git checkout deis
 make
 cd ..
 rm -rf buildstep