Ignore a mismatching minor compat-version. A minor version hints an
incompatibility with configuration, which Gluon re-generates based on
the intent on upgrade. Thus, only mismatching major versions present
a reason to block installation.
This is required to provide a migration path from swconfig to DSA based
ethernet architectures.
Signed-off-by: David Bauer <mail@david-bauer.net>