[Buildbot] #3183: fix network "spottiness" on new infra

[Buildbot trac]

#3183: fix network "spottiness" on new infra
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Reporter:  dustin    |       Owner:  verm
    Type:  defect    |      Status:  accepted
Priority:  critical  |   Milestone:  sys - other
 Version:            |  Resolution:
Keywords:            |
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Comment (by dustin):

 Of course, that's absolutely it.  The bridge isn't bridging the component
 interfaces of the lagg -- it's bridging VLAN 80 (vlan0) and VLAN 1
 (lagg0).  So every broadcast packet on VLAN 80 ends up bridged to the
 switch on Po33, which causes the flaps.

 There's no actual *loop*, but definitely a misconfiguration.

 We deleted the bridge0 interface, which should fix the issue.  Going
 forward, we'll need to bridge bhyve's tap interfaces to lagg0 and vlan0
 individually.

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Ticket URL: <http://trac.buildbot.net/ticket/3183#comment:38>
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