[Buildbot] #3450: replace sa.Table with sautils.Table

[Buildbot trac]

#3450: replace sa.Table with sautils.Table
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Reporter:  rutsky     |      Owner:
    Type:  undecided  |     Status:  new
Priority:  major      |  Milestone:  0.9.+
 Version:  master     |   Keywords:
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 sautils.Table wrapper handles common table settings.
 ATM it's MySQL default table encoding.

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Ticket URL: <http://trac.buildbot.net/ticket/3450>
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Buildbot: build/test automation