Mac OSX boot2docker support: do not try to run commands as the external user since root is mapped to the external user via VirtualBox on the docker server
Mac OSX boot2docker support: do not try to run commands as the external user since root is mapped to the external user via VirtualBox on the docker server

guillermo-carrasco/bcbio-nextgen-vm,guillermo-carrasco/bcbio-nextgen-vm,brainstorm/bcbio-nextgen-vm,chapmanb/bcbio-nextgen-vm,fw1121/bcbio-nextgen-vm,fw1121/bcbio-nextgen-vm,chapmanb/bcbio-nextgen-vm,brainstorm/bcbio-nextgen-vm,alexandrucoman/bcbio-nextgen-vm,alexandrucoman/bcbio-nextgen-vm