LP104785: Selfcheck needs to be run with HTTPS

Redirect attempts to connect to the self-check via HTTP to the more secure
HTTPS instead. Addresses this bug reported in launchpad:
https://bugs.launchpad.net/evergreen/+bug/1047485

Based on work for Apache 2.2 by Michael Peters <mrpeters@library.in.gov>,
updated and applied to 2.4 by Elliot Voris.

Signed-off-by: Elliot Voris <evoris@slcconline.edu>
Signed-off-by: Dan Scott <dscott@laurentian.ca>