Use docker-engine in setup_gate

The fedora version of docker is hacked by Red Hat to have specific
features which we don't want in the gating.  Use the pristine
upstream version from Docker Inc.

Change-Id: Ied219bc3868176f541083e9d42cde7d6cdeeb71d
Partially-Implements: blueprint gate-source-builds

tests/setup_gate.sh

@@ -2,14 +2,13 @@
 
 set -e
 
-sudo yum install -y libffi-devel openssl-devel docker
-sudo /usr/sbin/usermod -a -G dockerroot ${SUDO_USER:-$USER}
+sudo yum install -y libffi-devel openssl-devel
+sudo yum install -y http://yum.dockerproject.org/repo/main/fedora/21/Packages/docker-engine-1.7.1-1.fc21.x86_64.rpm
 sudo systemctl start docker
 sleep 1
 
-group_str="jenkins ALL=(:dockerroot) NOPASSWD: ALL"
+group_str="jenkins ALL=(:docker) NOPASSWD: ALL"
 sudo grep -x "$group_str" /etc/sudoers > /dev/null || sudo bash -c "echo \"$group_str\" >> /etc/sudoers"
-sudo chown root:dockerroot /var/run/docker.sock
 
 # disable ipv6 until we're sure routes to fedora mirrors work properly
 sudo sh -c 'echo "net.ipv6.conf.all.disable_ipv6 = 1" >> /etc/sysctl.conf'

tox.ini

@@ -35,9 +35,12 @@ whitelist_externals = find
                       bash
                       sudo
 commands =
+   bash -c "if [ -f .buildconf ]; then mv .buildconf buildconf.bak; fi"
+   bash -c "echo PREFIX=centos-rdo- > .buildconf"
    find . -type f -name "*.pyc" -delete
    bash -c "if [ ! -d .testrepository ]; then testr init; fi"
-   sudo -g dockerroot testr run ^(test_images).*
+   sudo -g docker testr run ^(test_images).*
+   bash -c "if [ -f buildconf.bak ]; then mv buildconf.bak .buildconf; fi"
 
 [testenv:startenv]
 whitelist_externals = bash