[Buildbot] #2856: update MAINTAINERS.txt

[Buildbot trac]

#2856: update MAINTAINERS.txt
-------------------+------------------------
Reporter:  dustin  |      Owner:  dustin
    Type:  task    |     Status:  new
Priority:  major   |  Milestone:  botherders
 Version:  0.8.9   |   Keywords:
-------------------+------------------------
 It should de-emphasize component maintenance, include the botherders, and
 include release managers.

--
Ticket URL: <http://trac.buildbot.net/ticket/2856>
Buildbot <http://buildbot.net/>
Buildbot: build/test automation