[google|compute] Add disk_size_gb to 'Image' model
[google|compute] Add disk_size_gb to 'Image' model

Added new field to Image model, named diskSizeGb, which shows the
size of the image when it is restored to a persistent disk, in GB.

cocktail-io/fog,mavenlink/fog,plribeiro3000/fog,brilliomsinterop/fog,phillbaker/fog,mohitsethi/fog,github/fog,surminus/fog,dtdream/fog,MSOpenTech/fog,icco/fog,nalabjp/fog,Programatica/fog,nandhanurrevanth/fog,joshmyers/fog,seanhandley/fog,bryanl/fog,sideci-sample/sideci-sample-fog,asebastian-r7/fog,glennpratt/fog,zephyrean/fog,lwander/fog,Ladas/fog,brilliomsinterop/fog,pyama86/fog,eLobato/fog,nalabjp/fog,brilliomsinterop/fog,cocktail-io/fog,rackspace/fog,mitchlloyd/fog,github/fog,bryanl/fog,rackspace/fog,surminus/fog,joshisa/fog,phillbaker/fog,martinb3/fog,runtimerevolution/fog,b0ric/fog,SpryBTS/fog,kongslund/fog,joshmyers/fog,fog/fog,mohitsethi/fog,adecarolis/fog,duhast/fog,glennpratt/fog,Programatica/fog,seanhandley/fog,eLobato/fog,ManageIQ/fog,zephyrean/fog,alphagov/fog,dustacio/fog,b0ric/fog,adamleff/fog,martinb3/fog,covario-cdiaz/fog,nicolasbrechet/fog,nandhanurrevanth/fog,dtdream/fog,pyama86/fog,10io/fog,phillbaker/fog,nandhanurrevanth/fog,backupify/fog,dustacio/fog,adamleff/fog,fog/fog,kongslund/fog,Ladas/fog,TerryHowe/fog,unorthodoxgeek/fog,ManageIQ/fog,icco/fog,MSOpenTech/fog,covario-cdiaz/fog,nicolasbrechet/fog,sideci-sample/sideci-sample-fog,alphagov/fog,backupify/fog,mitchlloyd/fog,pravi/fog,yyuu/fog,yyuu/fog,lwander/fog,dhague/fog,papedaniel/fog,ack/fog,adecarolis/fog,displague/fog,SpryBTS/fog,asebastian-r7/fog,dLobatog/fog,pravi/fog,TerryHowe/fog,sapcc/fog,runtimerevolution/fog,ack/fog,dhague/fog,displague/fog,10io/fog,plribeiro3000/fog,zephyrean/fog,sapcc/fog,duhast/fog,dLobatog/fog,theforeman/fog,joshisa/fog,unorthodoxgeek/fog,theforeman/fog,mavenlink/fog,papedaniel/fog