Deployer: Allow override vm_host (e.g. aws, openstack, etc...) from command-line.
Deployer: Allow override vm_host (e.g. aws, openstack, etc...) from command-line.

heuermh/cloudbiolinux,joemphilips/cloudbiolinux,heuermh/cloudbiolinux,pjotrp/cloudbiolinux,AICIDNN/cloudbiolinux,elkingtonmcb/cloudbiolinux,AICIDNN/cloudbiolinux,chapmanb/cloudbiolinux,elkingtonmcb/cloudbiolinux,kdaily/cloudbiolinux,chapmanb/cloudbiolinux,joemphilips/cloudbiolinux,heuermh/cloudbiolinux,kdaily/cloudbiolinux,rchekaluk/cloudbiolinux,kdaily/cloudbiolinux,averagehat/cloudbiolinux,elkingtonmcb/cloudbiolinux,elkingtonmcb/cloudbiolinux,chapmanb/cloudbiolinux,averagehat/cloudbiolinux,averagehat/cloudbiolinux,lpantano/cloudbiolinux,heuermh/cloudbiolinux,rchekaluk/cloudbiolinux,averagehat/cloudbiolinux,AICIDNN/cloudbiolinux,kdaily/cloudbiolinux,rchekaluk/cloudbiolinux,rchekaluk/cloudbiolinux,joemphilips/cloudbiolinux,pjotrp/cloudbiolinux,AICIDNN/cloudbiolinux,chapmanb/cloudbiolinux,lpantano/cloudbiolinux,joemphilips/cloudbiolinux,pjotrp/cloudbiolinux,lpantano/cloudbiolinux,pjotrp/cloudbiolinux