Fix StartStopSshDriverTest.setUp
AutoScalerPolicyTest repeated test: gc in setup

- Try to fix jenkins failure where the "repeated" test, which runs a
  time-sensitive test 100 consecutive times, fails occasionally due to
  scale out/back taking a couple of seconds longer than expected. I
  suspect it fails due to a slow GC in the middle of the test. 
  Therefore GC as part of setup for integration tests.
Karaf: add dependency on org.osgi:core v4.3

- Because jenkins gave ClassNotFoundException for
  org.osgi.framework.BundleException
Disable QpidIntegrationTest.canStartupAndShutdownWithPlugin

- It relies on quid v0.14 for the plugin we're using, but that is
  no longer available for download. Need to update the plugin code
  to work with the latest qpid.
Upgrade QpidBroker to 0.20 from 0.18
Merge pull request #487 from aledsage/fix/IntegrationTests-20130128

Fix integration tests