made nfs-utils-lib a special exception as it does not exist in Centos7

roles/nfs-client/tasks/main.yml

@@ -5,7 +5,13 @@
   with_items:
     - libnfsidmap 
     - nfs-utils
-    - nfs-utils-lib
   when: ansible_os_family == "RedHat" and ansible_distribution_major_version == "7"
 
+- name: install dependencies
+  yum: name={{ item }} state=installed
+  sudo: true
+  with_items:
+    - nfs-utils-lib
+  when: ansible_os_family == "RedHat" and ansible_distribution_major_version < "7"
+
 - include: mountFileSystem.yml