Adapt tests to changed behavior in Gerrit core

Since change I2a57fe087 calling change owners are no longer added as
reviewer if they use the PostReview REST endpoint without voting.

Signed-off-by: Edwin Kempin <ekempin@google.com>
Change-Id: I597f23c9c9d0c91ff8e9323bbc07476267fbcf2d
1 file changed