We want to access this in db migrations, which happen very early, but
runes_init needs the db, creating a circular dependency which must be
split.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
The uid isn't enough: it could be someone else's rune. This is tested
in the command rune list tests.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This extracts the core checking functionality for a rune, so they can
easily be used more widely than just commando.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
