docker-support doesn't quite work for docker with base:core22

[Dimitri John Ledkov]

core20
+ sudo docker run --rm hello-world
docker: Error response from daemon: AppArmor enabled on system but the docker-default profile could not be loaded: running `/usr/sbin/apparmor_parser apparmor_parser --version` failed with output: Failed to load policy-features from '/etc/apparmor.d/abi/2.13': Permission denied

core22
+ sudo docker run --rm hello-world
docker: Error response from daemon: AppArmor enabled on system but the docker-default profile could not be loaded: running `/usr/sbin/apparmor_parser apparmor_parser --version` failed with output: Failed to load policy-features from '/etc/apparmor.d/abi/kernel-5.4-outoftree-network': Permission denied

it seems modern apparmor_parser wants to read the abi policy file by default, as specified by default in the parser.conf. In such cases, reading such files should be allowed.

Imho `apparmor_parser --version` should pass, as needed for the docker support interface.

[Michael Vogt (mvo)]

Merged in https://github.com/snapcore/snapd/pull/12644