remove meta dependency of ansible-role-pam and document it instead

 - galaxy complains about this with something like
"Error parsing dependency Expecting dependency name format to match
'username.role_name', instead got ansible-role-pam"
 - also change categories to galaxy_tags

README.md

@@ -56,6 +56,21 @@ fgci_slurmrepo_version: "fgcislurm1605"
 
 A playbook that uses this role: https://github.com/CSC-IT-Center-for-Science/fgci-ansible
 
+Or you can check out the [tests/test.yml](tests/test.yml) in this repo.
+
+Example Playbook
+----------------
+
+Including an example of how to use your role (for instance, with variables passed in as parameters) is always nice for users too:
+
+<pre>
+    - hosts: servers
+      roles:
+         - { role: ansible-role-pam }
+         - { role: ansible-role-nhc }
+         - { role: ansible-role-slurm }
+</pre>
+
 ### Known Issues
 
  - This role used to be able to build slurm rpms, distribute them and install them. The last tag/release that had this feature was v1.5.0

meta/main.yml

@@ -117,24 +117,11 @@ galaxy_info:
   # Below are all categories currently available. Just as with
   # the platforms above, uncomment those that apply to your role.
   #
-  categories:
-  #- cloud
-  #- cloud:ec2
-  #- cloud:gce
-  #- cloud:rax
-  - clustering
-  #- database
-  #- database:nosql
-  #- database:sql
-  #- development
-  #- monitoring
-  #- networking
-  #- packaging
-  - system
-  #- web
-dependencies: 
+  galaxy_tags:
+   - clustering
+   - system
+dependencies: []
   # List your role dependencies here, one per line.
   # Be sure to remove the '[]' above if you add dependencies
   # to this list.
-  - { role: ansible-role-pam }