net/wireguard-tools: Various fixes for the rc.d scripts
- Introduce wireguard_confdir to rc.d script
- Fix variables and load_rc_config order in rc.d script
- Change rc.d scripts to run earlier after NETWORKING is available
Submitted by: niels@netbox.org
(cherry picked from commit 9986bb780c473fe5a1a2821d14aead6b3bcaadbe)