Be explicit with AnsibleModule types

When moving to ansible 2.1.0.0, we'll need to be more explicity about
our AnsibleModule parameters. Ansible now defaults them to strings.

This will ensure groups is a list.

Change-Id: Ic126c200a432277c0ef406d4406f527d6a3c9fa7
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

library/puppet_get_hiera_file_list

@@ -42,9 +42,9 @@ author: Monty Taylor
 def main():
     module = AnsibleModule(
         argument_spec=dict(
-            fqdn=dict(required=True),
-            groups=dict(required=True),
-            location=dict(required=True),
+            fqdn=dict(required=True, type='string'),
+            groups=dict(required=True, type='list'),
+            location=dict(required=True, type='string'),
         ),
     )
     p = module.params