Update B300-E7 model

PROD-37077

Change-Id: Ic3d79a338e88864e40d2cacd4c656012d9ed84c2
diff --git a/tcp_tests/templates/bm-b300-e7-cicd-pike-ovs-maas/salt-context-cookiecutter-openstack_ovs.yaml b/tcp_tests/templates/bm-b300-e7-cicd-pike-ovs-maas/salt-context-cookiecutter-openstack_ovs.yaml
index 27b0ad6..313a5a2 100755
--- a/tcp_tests/templates/bm-b300-e7-cicd-pike-ovs-maas/salt-context-cookiecutter-openstack_ovs.yaml
+++ b/tcp_tests/templates/bm-b300-e7-cicd-pike-ovs-maas/salt-context-cookiecutter-openstack_ovs.yaml
@@ -530,6 +530,7 @@
   openstack_dns_node02_address: 10.167.11.114
   nova_vnc_tls_enabled: 'True'
   galera_ssl_enabled: 'True'
+  galera_mysql_version: 5.7
   openstack_mysql_x509_enabled: 'True'
   rabbitmq_ssl_enabled: 'True'
   openstack_rabbitmq_x509_enabled: 'True'