[Buildbot] #2588: Check in upgrade_master that `rotateLength` and `maxRotatedFiles` are valid

[Buildbot trac]

#2588: Check in upgrade_master that `rotateLength` and `maxRotatedFiles` are valid
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Reporter:  rutsky     |       Owner:  Jc2k
    Type:  undecided  |      Status:  closed
Priority:  blocker    |   Milestone:  0.8.9
 Version:  0.8.8      |  Resolution:  fixed
Keywords:             |
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Changes (by Jc2k):

 * status:  assigned => closed
 * resolution:   => fixed


Comment:

 Merged into buildbot-0.8.9.

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Ticket URL: <http://trac.buildbot.net/ticket/2588#comment:3>
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