Pin glusterfs-5 repo

Change-Id: I586124a4c2053fdbe09688696e78bddde44871b5
Related: PROD-21761
diff --git a/defaults/linux_system_repo.yml b/defaults/linux_system_repo.yml
index 74c5f41..d85aea1 100644
--- a/defaults/linux_system_repo.yml
+++ b/defaults/linux_system_repo.yml
@@ -68,7 +68,7 @@
     # Repo-component versions (if applicable)
     salt_version: 2017.7 # TODO should be deprecated variable after 2018.q4
     linux_system_repo_mcp_cassandra_version: '21x'
-    linux_system_repo_mcp_glusterfs_version_number: "3.8"
+    linux_system_repo_mcp_glusterfs_version_number: "5"
     linux_system_repo_mcp_saltstack_version_number: "${_param:salt_version}"
     linux_system_repo_mcp_ceph_codename: luminous
     linux_repo_contrail_component: oc40