Description of problem:
It should not be possible to start more than one wallaby agent per broker.
Version-Release number of selected component (if applicable):
Start a wallaby agent. Then start another.
Both agents run at the same time, potentially breaking the command-line tools.
Only one agent should run per broker at a time.
This is fixed in 0.9.0.
Tested with (version):
REHEL5 x86_64,i386 - passed