344 - added the skip decorator to three tests.
344 - added the skip decorator to three tests.

Three tests were missing the @skip_if_not_module('redis') decorator.

https://github.com/celery/kombu/issues/344

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