[Buildbot] #3451: tests running with MySQL backend produces suspicious warnings

[Buildbot trac]

#3451: tests running with MySQL backend produces suspicious warnings
----------------------+-------------------
Reporter:  rutsky     |      Owner:
    Type:  undecided  |     Status:  new
Priority:  major      |  Milestone:  0.9.+
 Version:  master     |   Keywords:
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 E.g. [https://travis-ci.org/buildbot/buildbot/jobs/108976653 these one]:

 {{{
 Warning: BLOB/TEXT column 'state_string' can't have a default value
 }}}

 In my env I also seen this warning:

 {{{
 Warning: Invalid utf8 character string: 'FFFF00'
 }}}

 This issue should be investigated.

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Ticket URL: <http://trac.buildbot.net/ticket/3451>
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