apache_log_metrics: Remove dependency on devserver_lib

Don't import devserver_lib just to set up a rotating log handler.

BUG=chromium:757002
TEST=unit tests

Change-Id: I00170a962ab5dcb63d0c980331371dbe79db0494
Reviewed-on: https://chromium-review.googlesource.com/621780
Commit-Ready: Paul Hobbs <phobbs@google.com>
Tested-by: Paul Hobbs <phobbs@google.com>
Reviewed-by: Richard Barnette <jrbarnette@google.com>
1 file changed