Fix DISTRO_NAME usage for centos7 element

In each of the changed files in this patch, the $DISTRO_NAME usage
is checking against "centos".  The valid value for the centos7
element for $DISTRO_NAME is "centos7"[1].

[1] http://git.io/8IvuTw

Change-Id: I5d59e195c38fc7ff5b3235e195171fafcf5b4f87

elements/check_mk-agent/install.d/99-check_mk_local_checks

@@ -6,7 +6,7 @@ set -eux
 set -o pipefail
 
 
-if [[ "rhel rhel7 centos fedora" =~ "$DISTRO_NAME" ]]; then
+if [[ "rhel rhel7 centos7 fedora" =~ "$DISTRO_NAME" ]]; then
     # we're running a RHEL-based distro, so we need to install to
     # /usr/share/check-mk-agent/local
     LOCAL_CHECK_ROOT=/usr/share/check-mk-agent/local

elements/keystone/install.d/keystone-source-install/70-keystone

@@ -25,7 +25,7 @@ $KEYSTONE_VENV_DIR/bin/pip install -U python-ldap ldappool
 
 # percona-tookit is NOT supported on Fedora (retrieved 25-06-2013)
 # http://www.percona.com/mysql-support/policies/percona-toolkit-supported-platforms-and-versions
-if [[ "ubuntu rhel rhel7 centos" =~ "$DISTRO_NAME" ]]; then
+if [[ "ubuntu rhel rhel7 centos7" =~ "$DISTRO_NAME" ]]; then
     if [[ "$DISTRO_NAME" =~ "rhel" && "$RELEASE" =~ "7." ]]; then
         exit 0
     fi

elements/mariadb-dev/pre-install.d/05-mysql-mariadb-repo

@@ -35,7 +35,7 @@ function add_apt_repo() {
     apt-get update
 }
 
-if [[ "rhel rhel7 centos fedora" =~ "$DISTRO_NAME" ]]; then
+if [[ "rhel rhel7 centos7 fedora" =~ "$DISTRO_NAME" ]]; then
     add_yum_repo
 elif [[ "ubuntu debian" =~ "$DISTRO_NAME" ]]; then
     add_apt_repo

elements/mysql/install.d/10-mysql

@@ -58,7 +58,7 @@ register-state-path /var/lib/mysql
 [ -d /var/log/mysql ] || install -d -o root -g mysql -m 0775 /var/log/mysql
 register-state-path --leave-symlink /var/log/mysql
 
-if [[ "rhel rhel7 centos fedora" =~ "$DISTRO_NAME" ]]; then
+if [[ "rhel rhel7 centos7 fedora" =~ "$DISTRO_NAME" ]]; then
     # mysql clients on redhat expect the socket at /var/lib/mysql/mysql.sock
     mkdir -p /var/lib/mysql
     ln -s /var/run/mysqld/mysqld.sock /var/lib/mysql/mysql.sock

elements/neutron-server/install.d/neutron-package-install/76-neutron

@@ -4,7 +4,7 @@ set -eux
 
 install-packages openstack-neutron openstack-neutron-ml2
 
-if [[ "rhel rhel7 centos fedora" =~ "$DISTRO_NAME" ]]; then
+if [[ "rhel rhel7 centos7 fedora" =~ "$DISTRO_NAME" ]]; then
     ln -s /etc/neutron/plugins/ml2/ml2_conf.ini /etc/neutron/plugin.ini
 
     # Packaged neutron is providing a requires.txt which breaks dependencies at

elements/nova-baremetal/install.d/nova-package-install/82-nova-bm-deploy-helper-link

@@ -2,7 +2,7 @@
 
 set -eux
 
-if [[ "rhel rhel7 centos fedora" =~ "$DISTRO_NAME" ]]; then
+if [[ "rhel rhel7 centos7 fedora" =~ "$DISTRO_NAME" ]]; then
     # This is a fix so that we can use the service file from the source install
     # with our packaged nova-baremetal-deploy-helper, which is missing the service:
     # https://bugzilla.redhat.com/show_bug.cgi?id=1055788