Abort assimilation attempt on non-member cleanly
Abort assimilation attempt on non-member cleanly

If a confluent instance has forgotten the collective, more cleanly
handle the situation, and abort the assimilation rather than assuming
the peer should be leader, unless txcount specifically is called out
as the reason.

jjohnson42/confluent,xcat2/confluent,whowutwut/confluent,xcat2/confluent,jjohnson42/confluent,jjohnson42/confluent,whowutwut/confluent,jjohnson42/confluent,xcat2/confluent,xcat2/confluent,whowutwut/confluent,xcat2/confluent,jjohnson42/confluent,whowutwut/confluent