Add Automation for generating the packstack man page

- packstack/installer/run_setup.py: Modified a little bit the printOptions()
  function to get a better rendering (more rst file friendly).
- docs/conf.py: The code added is largely inspired by the printOptions()
  function.
- This should definitely keep the man page synchronized with code !

Change-Id: I4b899d6b78be860da1ec05341e2f7a36a4c4f71c

packstack/installer/run_setup.py

@@ -747,7 +747,8 @@ def printOptions():
             cmdOption = param.CONF_NAME
             paramUsage = param.USAGE
             optionsList = param.OPTION_LIST or ""
-            print "%s : %s %s"%(("**%s**"%str(cmdOption)).ljust(30), paramUsage, optionsList)
+            print "%s" % (("**%s**"%str(cmdOption)).ljust(30))
+            print "    %s %s" % (paramUsage, optionsList)
             print
 
 def plugin_compare(x, y):