Fix the clean task when directory not present
Fix the clean task when directory not present

The Makefile has clean task that was failing when the ./rootfs/tiller
was not present

technosophos/deployment-manager,adamreese/deployment-manager,sushilkm/helm,thomastaylor312/helm,vaikas-google/deployment-manager,kdada/helm,eicnix/helm,technosophos/deployment-manager,technosophos/deployment-manager,adamreese/deployment-manager,FengyunPan/helm,qwangrepos/helm,bacongobbler/helm,adamreese/deployment-manager,yan234280533/helm,adamreese/helm,michelleN/deployment-manager,helm/helm,eicnix/helm,thomastaylor312/helm,technosophos/deployment-manager,michelleN/deployment-manager,iamzhout/helm,yan234280533/helm,jascott1/helm,jascott1/helm,michelleN/deployment-manager,adamreese/helm,fibonacci1729/helm,bacongobbler/helm,appscode/helm,technosophos/k8s-helm,sushilkm/helm,vaikas-google/deployment-manager,rbwsam/helm,michelleN/deployment-manager,appscode/helm,technosophos/k8s-helm,qwangrepos/helm,FengyunPan/helm,bradj/helm,technosophos/deployment-manager,iamzhout/helm,SlickNik/helm,helm/helm,rbwsam/helm,kdada/helm,adamreese/deployment-manager,fibonacci1729/helm,SlickNik/helm,flynnduism/helm,flynnduism/helm,bradj/helm,adamreese/deployment-manager