Fix: 'python' highlighting when not used as a keyword

It seems vscode-tmgrammar-test does not remove '>' in the beginning of the test cases before executing them. It results that '>python' will not match with a regex such as '^python'. Hence some tests had to be modified.

client/syntaxes/bitbake.tmLanguage.json

@@ -61,7 +61,7 @@
                     "include": "#python-keywords"
                 },
                 {
-                    "match": "\\b(python|def)\\b(\\(?)",
+                    "match": "(?<=^|^fakeroot +)\\b(python|def)\\b",
                     "captures": {
                         "1": {
                             "name": "storage.type.function.python.bb"

client/test/grammars/test-cases/functions.bb

@@ -25,8 +25,8 @@
 >    else:
 >        return "dependency"
 
->python () {
-#^^^^^^ source.bb storage.type.function.python.bb - entity.name.function.python.bb
+python () {
+#<------ source.bb storage.type.function.python.bb - entity.name.function.python.bb
 >    if d.getVar('SOMEVAR') == 'value':
 #         ^^^^^^ source.bb entity.name.function.python.bb
 >      d.setVar('ANOTHERVAR', 'value2')

client/test/grammars/test-cases/keywords.bb

@@ -30,15 +30,15 @@
 >INHERIT += "autotools pkgconfig"
 #^^^^^^^ source.bb keyword.control.bb
 
->fakeroot python foo3() {}
-#^^^^^^^^ source.bb keyword.control.bb
-#         ^^^^^^ source.bb storage.type.function.python.bb
+fakeroot python foo3() {}
+#<-------- source.bb keyword.control.bb
+#        ^^^^^^ source.bb storage.type.function.python.bb
 
->python (){}
-#^^^^^^ source.bb storage.type.function.python.bb
+python (){}
+#<------ source.bb storage.type.function.python.bb
 
 >inherit_defer foo2
 #^^^^^^^^^^^^^ source.bb keyword.control.bb
 
->python(){}
-#^^^^^^ source.bb storage.type.function.python.bb
+python(){}
+#<------ source.bb storage.type.function.python.bb