Switching false to none for preallocate_images
Switching false to none for preallocate_images

The correct value as documented by Openstack is none

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