Switch test env to use ubuntu-14.04.
Switch test env to use ubuntu-14.04.

Start a topic branch which runs tests on ubuntu-14.04,
in preparation for a later upgrade.

channus/ursula,sivakom/ursula,pgraziano/ursula,kennjason/ursula,blueboxgroup/ursula,aldevigi/ursula,persistent-ursula/ursula,edtubillara/ursula,nirajdp76/ursula,allomov/ursula,nirajdp76/ursula,j2sol/ursula,aldevigi/ursula,sivakom/ursula,wupeiran/ursula,pgraziano/ursula,blueboxgroup/ursula,j2sol/ursula,davidcusatis/ursula,knandya/ursula,aldevigi/ursula,rongzhus/ursula,panxia6679/ursula,pbannister/ursula,andrewrothstein/ursula,dlundquist/ursula,rongzhus/ursula,twaldrop/ursula,ddaskal/ursula,wupeiran/ursula,ddaskal/ursula,ddaskal/ursula,msambol/ursula,dlundquist/ursula,andrewrothstein/ursula,greghaynes/ursula,wupeiran/ursula,pgraziano/ursula,masteinhauser/ursula,blueboxjesse/ursula,edtubillara/ursula,zrs233/ursula,masteinhauser/ursula,greghaynes/ursula,lihkin213/ursula,nirajdp76/ursula,allomov/ursula,channus/ursula,davidcusatis/ursula,j2sol/ursula,jwaibel/ursula,panxia6679/ursula,pbannister/ursula,persistent-ursula/ursula,EricCrosson/ursula,andrewrothstein/ursula,knandya/ursula,mjbrewer/ursula,msambol/ursula,masteinhauser/ursula,nirajdp76/ursula,twaldrop/ursula,MaheshIBM/ursula,paulczar/ursula,narengan/ursula,rongzhus/ursula,fancyhe/ursula,blueboxjesse/ursula,channus/ursula,panxia6679/ursula,pgraziano/ursula,fancyhe/ursula,twaldrop/ursula,MaheshIBM/ursula,EricCrosson/ursula,ryshah/ursula,narengan/ursula,paulczar/ursula,greghaynes/ursula,wupeiran/ursula,zrs233/ursula,dlundquist/ursula,narengan/ursula,pbannister/ursula,fancyhe/ursula,blueboxgroup/ursula,panxia6679/ursula,kennjason/ursula,lihkin213/ursula,msambol/ursula,EricCrosson/ursula,ryshah/ursula,zrs233/ursula,persistent-ursula/ursula,zrs233/ursula,lihkin213/ursula,jwaibel/ursula,knandya/ursula,edtubillara/ursula,paulczar/ursula,ryshah/ursula,edtubillara/ursula,twaldrop/ursula,sivakom/ursula,allomov/ursula,fancyhe/ursula,ryshah/ursula,mjbrewer/ursula,lihkin213/ursula,persistent-ursula/ursula,ddaskal/ursula,blueboxjesse/ursula,knandya/ursula,mjbrewer/ursula,kennjason/ursula,rongzhus/ursula,davidcusatis/ursula,blueboxjesse/ursula,masteinhauser/ursula,MaheshIBM/ursula,channus/ursula,narengan/ursula,j2sol/ursula,blueboxgroup/ursula,jwaibel/ursula