bareudp: Add extack support to bareudp_configure()

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2032483 Upstream Status: net-next.git

Patches 1-2 simplify the code and allow patch 3 to actually add missing extacks easily.

Signed-off-by: Guillaume Nault gnault@redhat.com