qapi: add a dictionary form with 'name' key for enum members

Desugar the enum NAME form to { 'name': NAME }. This will allow to add
new enum members, such as 'if' in the following patch.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20181213123724.4866-7-marcandre.lureau@redhat.com>
Message-Id: <20181213123724.4866-8-marcandre.lureau@redhat.com>
Message-Id: <20181213123724.4866-9-marcandre.lureau@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
[Harmless accidental move backed out, long line wrapped, patches
squashed]
Signed-off-by: Markus Armbruster <armbru@redhat.com>

tests/qapi-schema/enum-bad-member.err

@@ -0,0 +1 @@
+tests/qapi-schema/enum-bad-member.json:2: Member of enum 'MyEnum' requires a string name

tests/qapi-schema/enum-bad-member.json

@@ -0,0 +1,2 @@
+# we reject any enum member that is not a string
+{ 'enum': 'MyEnum', 'data': [ [ ] ] }

tests/qapi-schema/enum-dict-member-unknown.err

@@ -0,0 +1,2 @@
+tests/qapi-schema/enum-dict-member-unknown.json:2: Unknown key 'bad-key' in dictionary member of enum 'MyEnum'
+Valid keys are 'name'.

tests/qapi-schema/enum-dict-member-unknown.exit

@@ -0,0 +1 @@
+1

tests/qapi-schema/enum-dict-member-unknown.json

@@ -0,0 +1,2 @@
+# we reject any enum member that is not a string or a dict with 'name'
+{ 'enum': 'MyEnum', 'data': [ { 'name': 'foo', 'bad-key': 'str' } ] }

tests/qapi-schema/enum-dict-member.err

@@ -1 +0,0 @@
-tests/qapi-schema/enum-dict-member.json:2: Member of enum 'MyEnum' requires a string name

tests/qapi-schema/enum-dict-member.json

@@ -1,2 +0,0 @@
-# we reject any enum member that is not a string
-{ 'enum': 'MyEnum', 'data': [ { 'value': 'str' } ] }