Use a provider for Xff blocking tests

Use a provider for Xff blocking tests

Move the block insertion to addDBData(), and use a provider to
itterate through the test strings.

This seems like the more correct way to run these tests, although it
still seems hacky, since the db isn't cleaned up after each test.

Change-Id: Ib22ce69797ec03a61b0cc330e8572865290ebd31