1577 spdxlicense generate (#1691)

Update the license_list.go to have more permissible inputs for greater SPDXID matching.
EX:
GPL3 gpl3 gpl-3 and GPL-3 can all map to GPL-3.0-only

By moving all strings to lower and removing the "-" we're able to return valid SPDX license ID for a greater diversity of input strings.
---------

Signed-off-by: Christopher Phillips <christopher.phillips@anchore.com>

internal/spdxlicense/license_test.go

@@ -6,83 +6,70 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
-func TestIDParse(t *testing.T) {
+func TestSPDXIDRecognition(t *testing.T) {
 	var tests = []struct {
 		shortName string
 		id        string
-		other     string
 		found     bool
 	}{
 		{
 			"GPL-1-only",
 			"GPL-1.0-only",
-			"",
+			true,
+		},
+		{
+			"gpl1",
+			"GPL-1.0-only",
+			true,
+		},
+		{
+			"gpl-1",
+			"GPL-1.0-only",
 			true,
 		},
 		{
 			"GPL-2",
 			"GPL-2.0-only",
-			"",
 			true,
 		},
 		{
 			"GPL-2+",
 			"GPL-2.0-or-later",
-			"",
 			true,
 		},
 		{
 			"GPL-3.0.0-or-later",
 			"GPL-3.0-or-later",
-			"",
 			true,
 		},
 		{
 			"GPL-3-with-autoconf-exception",
 			"GPL-3.0-with-autoconf-exception",
-			"",
 			true,
 		},
 		{
 			"CC-by-nc-3-de",
 			"CC-BY-NC-3.0-DE",
-			"",
 			true,
 		},
 		// the below few cases are NOT expected, however, seem unavoidable given the current approach
-		{
-			"w3c-20150513.0.0",
-			"W3C-20150513",
-			"",
-			true,
-		},
 		{
 			"spencer-86.0.0",
 			"Spencer-86",
-			"",
 			true,
 		},
 		{
 			"unicode-dfs-2015.0.0",
 			"Unicode-DFS-2015",
-			"",
 			true,
 		},
 		{
 			"Unknown",
 			"",
-			"Unknown",
-			true,
-		},
-		{
-			"   ",
-			"",
-			"",
 			false,
 		},
 		{
-			"AND",
-			"",
+			"   ",
 			"",
 			false,
 		},
@@ -90,10 +77,9 @@ func TestIDParse(t *testing.T) {
 
 	for _, test := range tests {
 		t.Run(test.shortName, func(t *testing.T) {
-			value, other, exists := ID(test.shortName)
+			value, exists := ID(test.shortName)
 			assert.Equal(t, test.found, exists)
 			assert.Equal(t, test.id, value)
-			assert.Equal(t, test.other, other)
 		})
 	}
 }