Bug 1212822 - Allow setting PULSE_EXCHANGE_NAMESPACE via the environment
Bug 1212822 - Allow setting PULSE_EXCHANGE_NAMESPACE via the environment

So it can still be set on stage/prod, where we want to stop using
local.py. (It's already set in the environment there, we just need to
start using it.)

avih/treeherder,tojon/treeherder,avih/treeherder,tojonmz/treeherder,KWierso/treeherder,gbrmachado/treeherder,gbrmachado/treeherder,edmorley/treeherder,glenn124f/treeherder,edmorley/treeherder,wlach/treeherder,kapy2010/treeherder,glenn124f/treeherder,kapy2010/treeherder,avih/treeherder,parkouss/treeherder,parkouss/treeherder,gbrmachado/treeherder,tojonmz/treeherder,kapy2010/treeherder,tojon/treeherder,tojon/treeherder,glenn124f/treeherder,akhileshpillai/treeherder,parkouss/treeherder,sylvestre/treeherder,avih/treeherder,parkouss/treeherder,KWierso/treeherder,avih/treeherder,edmorley/treeherder,tojon/treeherder,KWierso/treeherder,gbrmachado/treeherder,akhileshpillai/treeherder,gbrmachado/treeherder,glenn124f/treeherder,akhileshpillai/treeherder,tojonmz/treeherder,akhileshpillai/treeherder,akhileshpillai/treeherder,akhileshpillai/treeherder,avih/treeherder,tojonmz/treeherder,sylvestre/treeherder,edmorley/treeherder,wlach/treeherder,wlach/treeherder,sylvestre/treeherder,KWierso/treeherder,parkouss/treeherder,wlach/treeherder,tojonmz/treeherder,wlach/treeherder,sylvestre/treeherder,kapy2010/treeherder,parkouss/treeherder,kapy2010/treeherder,gbrmachado/treeherder,glenn124f/treeherder,sylvestre/treeherder,sylvestre/treeherder,glenn124f/treeherder,tojonmz/treeherder,wlach/treeherder