Revert "UBUNTU: SAUCE: apparmor: Fix: convert replacedby update to be protected by the labelset lock"

BugLink: http://bugs.launchpad.net/bugs/1379535

This reverts commit 6b05f95e2bd24c98400eae1c25d36a10242e7f5b.
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>