The abstractions/container-base file is partially automatically
generated.  The two source files are container-rules.base and
abstractions/container-base.in.  If these file are updated,
then

1. Generate a new container-rules file using

./lxc-generate-aa-rules.py container-rules.base > container-rules

2. Concatenate container-base.in with container-rules using

cat abstractions/container-base.in container-rules > abstractions/container-base