Rename lustre_repo default to lustre_git_repo

Author: m-bull

ansible/roles/lustre/defaults/main.yml

@@ -6,7 +6,7 @@ lustre_mount_state: mounted
 lustre_mount_options: 'defaults,_netdev,noauto,x-systemd.automount,x-systemd.requires=lnet.service'
 
 # below variables are for build and should not generally require changes
-lustre_repo: "git://git.whamcloud.com/fs/lustre-release.git"
+lustre_git_repo: "git://git.whamcloud.com/fs/lustre-release.git"
 lustre_build_packages:
   - "kernel-devel-{{ ansible_kernel }}"
   - git