After watching it carefully, I found two problems:
1, compute node should set hostname, or ovs process will exit due to below 
error log
   Stderr: 'sudo: unable to resolve host 
juju-precise-machine-11\n2015-01-04T06:41:49Z|00001|fatal_signal|WARN|terminating
 with signal 14 (Alarm clock)\n'

2, also should restart ovs process after rescheduling the l3-agent, or
ovs will not create the tunnel again.

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https://bugs.launchpad.net/bugs/1405588

Title:
  database connection failed (Protocol error)

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