Remove linux specific calls

Docker-DCO-1.1-Signed-off-by: Guillaume J. Charmes <guillaume.charmes@docker.com> (github: creack)
Add Freebsd client support

Docker-DCO-1.1-Signed-off-by: Guillaume J. Charmes <guillaume.charmes@docker.com> (github: creack)
Create directories for tar files with relaxed permissions

Docker-DCO-1.1-Signed-off-by: Alexey Kotlyarov <alexey@infoxchange.net.au> (github: koterpillar)
Merge branch 'master' into add_freebsd_support

Conflicts:
	archive/archive.go
	archive/start_unsupported.go
remove useless lock
move job to server and remove version.go

Docker-DCO-1.1-Signed-off-by: Victor Vieux <victor.vieux@docker.com> (github: vieux)
Update vendor for kr/pty

Docker-DCO-1.1-Signed-off-by: Guillaume J. Charmes <guillaume.charmes@docker.com> (github: creack)
Update bsd specs

Docker-DCO-1.1-Signed-off-by: Guillaume J. Charmes <guillaume.charmes@docker.com> (github: creack)
Update vendor.sh with new kr/pty revision

Docker-DCO-1.1-Signed-off-by: Guillaume J. Charmes <guillaume@charmes.net> (github: creack)
Merge pull request #3985 from creack/add_freebsd_support

Add freebsd client support
Merge pull request #4440 from infoxchange/aufs-permissions-4068

Create directories for tar files with relaxed permissions
Merge pull request #4564 from vieux/remove_unused_version

Remove unused version.go
nsinit: prefix errors with their source

Docker-DCO-1.1-Signed-off-by: Sridhar Ratnakumar <github@srid.name> (github: srid)
Merge pull request #4566 from srid/nsinit_uniq_errors

nsinit: prefix errors with their source