New bugfix release 2.49.2

New bugfix release:

• interfaces/tee: add TEE/OPTEE interface
• o/configstate/configcore: add hdmi_timings to pi-config
• interfaces/udisks2: allow locking /run/mount/utab for udisks 2.8.4
• snap-seccomp: fix seccomp test on ppc64el
• interfaces{,/apparmor}, overlord/snapstate: late removal of snap-confine apparmor profiles
• overlord/snapstate, wrappers: add dependency on usr-lib-snapd.mount for services on core with snapd snap
• o/configstate: deal with no longer valid refresh.timer=managed
• overlord/snapstate: make sure that snapd current symlink is not removed during refresh
• packaging: drop dh-systemd from build-depends on ubuntu-16.04+
• o/{device,hook}state: encode fde-setup-request key as base64
• snapstate: reduce reRefreshRetryTimeout to 1/2 second
• tests/main/uc20-create-partitions: fix tests cleanup
• o/configstate, o/snapshotstate: fix handling of nil snap config on snapshot restore
• snap-seccomp: add new close_range syscall