apparmor: write & load the profile on every start

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
Don't rejoin the cgroup each time
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Merge pull request #6180 from unclejack/apparmor

apparmor: write & load the profile on every start
Merge pull request #6183 from crosbymichael/fix-freezer-fs

Don't rejoin the freezer cgroup each time
fix diffs->diff typo in aufs.go

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
Merge pull request #6186 from unclejack/fix_typo_aufsgo

fix diffs->diff typo in aufs.go