Fix the default value of cifmw_nfs_target

The target var should be "computes", not "compute".
It raises an issue that later the host is skipped by the Ansible.

This commit fixes porting issue raised in Pull Request [1].

[1] #3038

Signed-off-by: Daniel Pawlik <dpawlik@redhat.com>

Author: danpawlik

roles/cifmw_nfs/defaults/main.yml

@@ -19,4 +19,4 @@
 # All variables within this role should have a prefix of "cifmw_nfs"
 
 cifmw_nfs_network: "storage"
-cifmw_nfs_target: "compute"
+cifmw_nfs_target: "computes"