chore(libsaltcli): add lib to check type of Salt command being used

* To distinguish between:
  - `salt-minion`
  - `salt-call`
  - `salt-ssh`
* Invoked like `map.jinja`:
  - `{%- from tplroot ~ "/libsaltcli.jinja" import cli with context %}`
* Based upon work done in PRs: saltstack-formulas#102, saltstack-formulas#114 & saltstack-formulas#115
* Finalised from saltstack-formulas/libvirt-formula#71
* Required by saltstack-formulas#186

TEMPLATE/libsaltcli.jinja

@@ -0,0 +1,16 @@
+# -*- coding: utf-8 -*-
+# vim: ft=jinja
+
+{#- Determine the type of command being run #}
+{%- if salt['config.get']('__cli') == 'salt-minion' %}
+{%-   set cli = 'minion' %}
+{%- elif salt['config.get']('__cli') == 'salt-call' %}
+{%-   if salt['config.get']('root_dir').endswith('/running_data') %}
+{%-     set cli = 'ssh' %}
+{%-   else %}
+{%-     set cli = 'local' %}
+{%-   endif %}
+{%- else %}
+{%-   set cli = 'unknown' %}
+{%- endif %}
+{%- do salt['log.debug']('[libsaltcli] the salt command type has been identified to be: ' ~ cli) %}