Add Git and Mercurial to build prerequisites
Add Git and Mercurial to build prerequisites

Closes: #2343

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