run-tests: fix MongoDB start wait

There's actually 2 lines that matches the current rule:

  [websvr] admin web console waiting for connections on port 30000
  [initandlisten] waiting for connections on port 29000

Let's make it more tighten.

Related-Bug: #1218488

Change-Id: I4ba56a7c2406a9851aa8087b4cabb0aa31698763
Catch exceptions from nova client in poll_and_publish

Ceilometer compute agent dies if nova client raises an exception while it is
retrieving server instances. This might happen e.g. when some OpenStack API is
temporarily unavailable

Fixes LP Bug #1218889

Change-Id: I808dcfae18d23240f8e095d6c97c8dede7dede8f
Merge "Catch exceptions from nova client in poll_and_publish"
Merge "run-tests: fix MongoDB start wait"