[Buildbot] #3174: make ansible playbook for keeping metabbotcfg up to date detect errors

[Buildbot trac]

#3174: make ansible playbook for keeping metabbotcfg up to date detect errors
-------------------+--------------------------------
Reporter:  sa2ajj  |      Owner:
    Type:  task    |     Status:  new
Priority:  major   |  Milestone:  sys - metabuildbot
 Version:          |   Keywords:  ansible
-------------------+--------------------------------
 It should be implemented in a way that

 * checks if the new config is OK
 * only then start using it

 If the config is NOK, somehow notify sysadmins.

--
Ticket URL: <http://trac.buildbot.net/ticket/3174>
Buildbot <http://buildbot.net/>
Buildbot: build/test automation