guests/redhat: remove erroneous yum upgrade.

This upgrade shouldn't be part of the docker setup process. If an
upgrade is needed, it should be done independently of the docker setup.
Do it to your base image, or if needed, as a shell provisioner step.

fix nfs on gentoo with systemd

hosts/freebsd: Changed order of nfs exports parameters for FreeBSD

This reverts commit 62561f28.

This broke WinRM. Will fix in a future version.

providers/docker: Unset container name if docker_run is called. Fixes #4294

guests/smartos: rsync_post has find permissions on smartos

provisioner/docker: Verbose output for docker provisioner

guest/freebsd: fix interface device names in /etc/rc.conf