rpms.adiscon.com not available via https

[atc0005]

Concerns:

Installing/trusting a package signing key would probably best be handled by downloading that key over an encrypted connection. As it stands now, the key only appears to be available over an unencrypted connection.

Once this is done, the rsyslog.repo files would need to be updated to reference the new https support.

-gpgkey=http://rpms.adiscon.com/RPM-GPG-KEY-Adiscon
+gpgkey=https://rpms.adiscon.com/RPM-GPG-KEY-Adiscon