[vcloud_director] fix progress reporting of tasks without progress
[vcloud_director] fix progress reporting of tasks without progress

Set progress to 0 in tasks that do not have progress prevents the
rendering of the progress of these tasks failing with a nil error.

According to vcloud api "Read-only indicator of task progress as an
approximate percentage between 0 and 100. Not available for all tasks."

http://pubs.vmware.com/vcd-55/index.jsp?topic=%2Fcom.vmware.vcloud.api.reference.doc_55%2Fdoc%2Ftypes%2FTaskType.html

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