[MacPorts] #49792: upgrade xcode on yosemite buildbot builder tenten-slave to 6.4

[MacPorts]

#49792: upgrade xcode on yosemite buildbot builder tenten-slave to 6.4
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  Reporter:  ryandesign@…    |      Owner:  admin@…
      Type:  enhancement     |     Status:  closed
  Priority:  Normal          |  Milestone:
 Component:  server/hosting  |    Version:
Resolution:  fixed           |   Keywords:
      Port:                  |
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Changes (by ryandesign@…):

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


Comment:

 I stopped the buildbot slaves. I upgraded Xcode, then opened it. The
 computer became unresponsive while "Verifying 'Xcode'". The screen sharing
 session terminated. I left it for several hours but it didn't reconnect.
 Using another screen sharing method to reconnect, each open app became
 unresponsive (beachball cursor) as I tried to use it. SSH access also was
 unavailable. So I powered off the machine and rebooted it. Used Disk
 Utility to verify the disk, which found no problems. Reopened Xcode, which
 verified successfully. Upgraded command line tools. I started the buildbot
 slaves again.

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Ticket URL: <https://trac.macports.org/ticket/49792#comment:1>
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