Fix custom transport overriding
Fix custom transport overriding

daevaorn/kombu,iris-edu-int/kombu,numb3r3/kombu,tkanemoto/kombu,ZoranPavlovic/kombu,jindongh/kombu,numb3r3/kombu,mverrilli/kombu,daevaorn/kombu,jindongh/kombu,ZoranPavlovic/kombu,urbn/kombu,celery/kombu,iris-edu-int/kombu,tkanemoto/kombu,mverrilli/kombu,Elastica/kombu,Elastica/kombu