IPv6 iPXE support

* Parse address and port with netip w/ tests
* Add Authority to provisioning templates based on remote IP family
  (name based on RFC 3986)
* Add IPv6 support to the default iPXE (tested)
* Update `grub.cfg.ww` to use Authority (untested)

Co-authored-by: Dacian Reece-Stremtan <dacianstremtan@gmail.com>
Co-authored-by: Timothy Middelkoop <tmiddelkoop@internet2.edu>
Signed-off-by: Timothy Middelkoop <tmiddelkoop@internet2.edu>

CHANGELOG.md

@@ -14,12 +14,16 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Added `DELETE /api/overlays/{name}/file?path={path}`
 - Added `wwctl configure warewulfd`
 - Added troubleshooting documentation regarding NUMA and tmpfs
+- Added support for IPv6 when booting with iPXE. #1852
 
 ### Changed
 
 - Restore default idempotency of `PUT /api/nodes/{id}`
 - `DELETE /api/overlays/{name}?force=true` can delete overlays that are in use
 - `warewulfd` overlay autobuild rebuilds overlays after node discovery. #1468
+
+### Fixed
+
 - Improved netplan support. #1873
 
 ### Fixed