mi: When {en,dis}abling extensions, match names case-insensitively

Both because extension names are inconsistently capitalized on the wire,
and because the table we're walking spells it COMPOSITE not Composite.
The latter is certainly also a bug, but there's no reason for us to be
that strict.

Signed-off-by: Adam Jackson <ajax@redhat.com>
2 jobs for kinder-extension-disable in 1 minute and 12 seconds (queued for 1 second)
Status Name Job ID Coverage
  Docker Image
passed debian-testing #82989

00:00:15

 
  Build And Test
passed build-and-test #82990

00:00:57