Performance: skip LVM configuration if no groups configured

Currently we import the manage-lvm role with a condition that skips
tasks when no LVM groups are configured. At large scale this is
inefficient.

This change improves the performance for hosts where there are no LVM
groups configured, by using include_role rather than a static import.

Story: 2007993
Task: 40664

Change-Id: Ib51ac445cc787d7045d72a9ecec14434d432d9e7

ansible/lvm.yml

@@ -4,7 +4,7 @@
   tags:
     - lvm
     - upgrade-check
-  pre_tasks:
+  tasks:
     - name: Fail if the LVM physical disks have not been configured
       fail:
         msg: >
@@ -13,6 +13,7 @@
           has a valid 'disks' list.
       with_items: "{{ lvm_groups | default([]) }}"
       when: not item.disks | default([]) or 'changeme' in item.disks | default([])
+
     - name: Fail if the LVM physical disks are configured as a comma-separated string
       fail:
         msg: >
@@ -21,10 +22,14 @@
           each volume group in 'lvm_groups' has a valid 'disks' list.
       with_items: "{{ lvm_groups | default([]) }}"
       when: item.disks | string() == item.disks
-  roles:
-    - role: mrlesmithjr.manage-lvm
-      manage_lvm: True
-      become: True
+
+    - name: Ensure LVM configuration is applied
+      vars:
+        manage_lvm: True
+      include_role:
+        name: mrlesmithjr.manage-lvm
+        apply:
+          become: True
       when:
         - lvm_groups is defined
         - lvm_groups | length > 0