salt: Rewrite init.sls for Salt minion

Add some explanation about all state in `init.sls` of Salt minion states

salt/metalk8s/salt/minion/init.sls

@@ -8,7 +8,11 @@
 # Available states
 # ================
 #
-# * restart   -> Restart salt Minion if required `watch_in` set
+# * local       -> Configure salt minion so that it can run in local mode
+#                  (need to have access on the ISO, so only run it on the bootstrap)
+# * installed   -> Install/Upgrade and enable salt minion
+# * configured  -> Configure salt minion process
+# * restart     -> Restart salt Minion if required `watch_in` set
 #
 
 include: