Change site_logging to cros_logging in server side test files.

Change-Id: I78bc265447ed5e43b2eb06d3b3391d30704e717a

BUG=7236
TEST=
Seems like I mis-tested the previous changelist since site_logging.py file was originally pulled into chroot.

The issue was revealed from a fresh client/chroot.

Now this should work.

New client --> new chroot --> emerge autotest --> run bvt.

Review URL: http://codereview.chromium.org/6088014
2 files changed