Removing Channel._poll().
Removing Channel._poll().

Channel._poll() was a leftover from when this Transport originally inherited
from kombu.transport.virtual.  The drain_events() now drains all consumers
without using _poll().

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