[libvirt] Add USER support to virt-sandbox-service

This patch set is adding support for UID/GID/USERNAME/USERDIR for use with openshift containers [sandbox PATCH 1/6] Add UID/GID support for use with interactive [sandbox PATCH 2/6] We should not turn on the sanbox shell by [sandbox PATCH 3/6] Only create the destination directory if it does [sandbox PATCH 4/6] Add support for --homedir and --username setting [sandbox PATCH 5/6] Add support for --uid, --gid, --username, [sandbox PATCH 6/6] Update man page to document current