Remove print statement from test_quotas that fails H233 check

The nova.tests.objects.test_quotas module had a print statement which is
causing a hacking H233 check failure. It was probably just left there
from debugging the code while it was under development, so this patch
simply removes it.

Closes-Bug: #1227655

Change-Id: I25296d7f4a9d2242bfe3ed2e00df6d840a7b19cd