set state_output to "changes"

Terse output is not enough for debugging.

Change-Id: Ida9a4ef0a2ad053fc370d3833d716d9e8d38d814

README.rst

@@ -177,7 +177,7 @@ Configure verbosity of state output (used for `salt` command)
 
     salt:
       master:
-        state_output: terse
+        state_output: changes
 
 Salt proxy
 ----------

salt/files/master.conf

@@ -4,7 +4,7 @@
 worker_threads: {{ master.worker_threads }}
 timeout: {{ master.command_timeout }}
 
-state_output: {{ master.get('state_output', 'terse') }}
+state_output: {{ master.get('state_output', 'changes') }}
 
 {%- if master.system is defined %}