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>

internal/pkg/warewulfd/parser_test.go

@@ -0,0 +1,53 @@
+package warewulfd
+
+import (
+	"net/http"
+	"net/url"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+var parseReqTests = []struct {
+	description string
+	url         string
+	remoteAddr  string
+	result      parserInfo
+}{
+	{
+		description: "basic ipv4 request",
+		url:         "/provision/00:00:00:ff:ff:ff",
+		remoteAddr:  "10.5.1.1:9873",
+		result: parserInfo{
+			hwaddr:     "00:00:00:ff:ff:ff",
+			ipaddr:     "10.5.1.1",
+			remoteport: 9873,
+			stage:      "ipxe",
+		},
+	},
+	{
+		description: "basic ipv6 request",
+		url:         "/provision/00:00:00:ff:ff:ff",
+		remoteAddr:  "[fd00:5::1:1]:9873",
+		result: parserInfo{
+			hwaddr:     "00:00:00:ff:ff:ff",
+			ipaddr:     "fd00:5::1:1",
+			remoteport: 9873,
+			stage:      "ipxe",
+		},
+	},
+}
+
+func Test_ParseReq(t *testing.T) {
+	for _, tt := range parseReqTests {
+		t.Run(tt.description, func(t *testing.T) {
+			req := &http.Request{
+				URL:        &url.URL{Path: tt.url},
+				RemoteAddr: tt.remoteAddr,
+			}
+			result, err := parseReq(req)
+			assert.NoError(t, err)
+			assert.Equal(t, tt.result, result)
+		})
+	}
+}