Domain name is not case sensitive, but Let's Encrypt certificate paths
use lower-case domain name.
Add an extra 1 second delay to tests that configure DynamicDNS domain.
Test: DynamicDNS functional tests are passing.
Signed-off-by: James Valleroy <jvalleroy@mailbox.org>
Reviewed-by: Veiko Aasa <veiko17@disroot.org>