Update openSUSE installation instructions

Out of box, the 'sudo' command on openSUSE does not work similarly to other distros.  In this case, the path to usermod should be explicitly given, since /usr/sbin, where usermod is located, is not on the sudoing user's PATH.  The other sudo commands here should be fine.
Update libcontainer to db65c35051d05f3fb218a0e84a1

Signed-off-by: Michael Crosby <michael@docker.com>
Merge pull request #7634 from krrg/patch-1

Update openSUSE installation instructions
Merge pull request #7648 from crosbymichael/update-libcontainer-aug5

Update libcontainer to db65c35051d05f3fb218a0e84a1
Merge remote-tracking branch 'origin/master' into bump_v1.2.0

Conflicts:
	VERSION
	daemon/container.go
	daemon/daemon.go

Signed-off-by: Victor Vieux <vieux@docker.com>
Bump version to v1.2.0

Signed-off-by: Victor Vieux <vieux@docker.com>