Use latest docker engine in gate

Kolla support latest docker engine right now.

Closes-Bug: #1661549
Change-Id: I5074fd16bdd158df8e97f909dead0a59a14fdf42

tools/setup_Debian.sh

@@ -57,7 +57,7 @@ source /etc/lsb-release
 echo "deb http://apt.dockerproject.org/repo ubuntu-${DISTRIB_CODENAME} main" | sudo tee /etc/apt/sources.list.d/docker.list
 add_key
 sudo apt-get update
-sudo apt-get -y install --no-install-recommends 'docker-engine=1.12.*'
+sudo apt-get -y install --no-install-recommends docker-engine
 
 sudo service docker stop
 if [[ ${DISTRIB_CODENAME} == "trusty" ]]; then

tools/setup_RedHat.sh

@@ -44,7 +44,7 @@ gpgcheck=1
 gpgkey=https://yum.dockerproject.org/gpg
 EOF
 
-sudo yum -y install libffi-devel openssl-devel docker-engine-1.12.6 docker-engine-selinux-1.12.6 btrfs-progs
+sudo yum -y install libffi-devel openssl-devel docker-engine docker-engine-selinux btrfs-progs
 
 setup_disk