Propose changes to always run the rabbitmq health check heartbeat in a
standard python thread.
With the described specs we want to isolate the heartbeat execution model
from the parent process inherited execution model.
We want to force to use the python stdlib threading module to run
heartbeat.
The proposed changes will fix related issues who run heartbeat under
mod_wsgi in a monkey patched environment.
Change-Id: Ia6d873c3fc5dcc6b1c181b983b9d0d2787348163
a26df0f3ce