fix broken tests introduced in 6e9c7cc441
fix broken tests introduced in 6e9c7cc441

Summary:
6e9c7cc441 introduced a change which appending a newline to graphite
messages, however the tests were not updated and were doing
`assertEqual` and were therefore failing because they didnt expect the
final newline

this change merely introduces the newlines into the expected test output
so that tests again pass.

Test Plan: `python tests/alertlib_test.py`

Reviewers: chris

Reviewed By: chris

Subscribers: csilvers

Differential Revision: https://phabricator.khanacademy.org/D20329

mroth/alertlib,Khan/alertlib