Bug 1160561 - Use correct env variable for PULSE_URI
Bug 1160561 - Use correct env variable for PULSE_URI

PULSE_USERNAME and PULSE_PASSWORD are not actually defined anywhere,
including in production. Instead we're relying on production's
local.py to set the value, rather than prod's PULSE_URI, which _is_ set.
By switching to use PULSE_URI, we're one step closer to not needing
local.py on prod.

edmorley/treeherder,parkouss/treeherder,avih/treeherder,moijes12/treeherder,edmorley/treeherder,sylvestre/treeherder,akhileshpillai/treeherder,edmorley/treeherder,adusca/treeherder,parkouss/treeherder,glenn124f/treeherder,akhileshpillai/treeherder,deathping1994/treeherder,jgraham/treeherder,tojonmz/treeherder,avih/treeherder,moijes12/treeherder,adusca/treeherder,vaishalitekale/treeherder,gbrmachado/treeherder,deathping1994/treeherder,parkouss/treeherder,akhileshpillai/treeherder,edmorley/treeherder,rail/treeherder,tojon/treeherder,wlach/treeherder,avih/treeherder,KWierso/treeherder,tojon/treeherder,rail/treeherder,glenn124f/treeherder,deathping1994/treeherder,tojonmz/treeherder,deathping1994/treeherder,tojonmz/treeherder,akhileshpillai/treeherder,moijes12/treeherder,wlach/treeherder,wlach/treeherder,moijes12/treeherder,avih/treeherder,glenn124f/treeherder,gbrmachado/treeherder,tojon/treeherder,kapy2010/treeherder,tojon/treeherder,glenn124f/treeherder,sylvestre/treeherder,rail/treeherder,KWierso/treeherder,parkouss/treeherder,rail/treeherder,tojonmz/treeherder,gbrmachado/treeherder,vaishalitekale/treeherder,akhileshpillai/treeherder,moijes12/treeherder,sylvestre/treeherder,tojonmz/treeherder,avih/treeherder,gbrmachado/treeherder,gbrmachado/treeherder,KWierso/treeherder,adusca/treeherder,vaishalitekale/treeherder,sylvestre/treeherder,wlach/treeherder,moijes12/treeherder,glenn124f/treeherder,tojonmz/treeherder,jgraham/treeherder,deathping1994/treeherder,gbrmachado/treeherder,sylvestre/treeherder,kapy2010/treeherder,vaishalitekale/treeherder,jgraham/treeherder,avih/treeherder,kapy2010/treeherder,adusca/treeherder,deathping1994/treeherder,akhileshpillai/treeherder,wlach/treeherder,wlach/treeherder,adusca/treeherder,parkouss/treeherder,sylvestre/treeherder,vaishalitekale/treeherder,KWierso/treeherder,glenn124f/treeherder,kapy2010/treeherder,rail/treeherder,vaishalitekale/treeherder,parkouss/treeherder,jgraham/treeherder,rail/treeherder,kapy2010/treeherder,jgraham/treeherder,adusca/treeherder,jgraham/treeherder