Remove now-defunct message priority methods
Remove now-defunct message priority methods

Should be no need to use these anywhere anymore; one can always do a filter
if they truly need this granularity on the messages in the queue.

Signed-off-by: Dan McGee <a6e5737275ff1276377ee261739f3ee963671241@gmail.com>

eriks5/django-mailer,PolicyStat/django-mailer,zyegfryed/django-mailer,mudiarto/django-mailer,PolicyStat/django-mailer,toofishes/django-mailer,filterfoundry/django-mailer