validate: check virtual_ips variable

This commit checks the length of `virtual_ips` doesn't exceed the length
of `groups[rgwloadbalancer_group_name]`.
It also ensure this variable is defined when
`groups[rgwloadbalancer_group_name]` contains at least one node.

Signed-off-by: Guillaume Abrioux <gabrioux@redhat.com>
(cherry picked from commit ae196bf946)

roles/ceph-validate/tasks/main.yml

@@ -279,3 +279,18 @@
     - keys is defined
     - keys | length > 0
     - item.caps is not defined
+
+- name: check virtual_ips is defined
+  fail:
+    msg: "virtual_ips is not defined."
+  when:
+    - rgwloadbalancer_group_name in group_names
+    - groups[rgwloadbalancer_group_name] | length > 0
+    - virtual_ips is not defined
+
+- name: validate virtual_ips length
+  fail:
+    msg: "There are more virual_ips defined than rgwloadbalancer nodes"
+  when:
+    - rgwloadbalancer_group_name in group_names
+    - (virtual_ips | length) > (groups[rgwloadbalancer_group_name] | length)