vppapigen: remove support for legacy typedefs

vppapigen has remapped legacy to typedefs behind the scenes
for some time now.

- update .api files to use new style typedefs.
- issue error on 'typeonly define' in .api files
- remove unneeded macros redefining vl_noop_handler

Type: refactor

Change-Id: I7a8c4a6dafacee6a131f95cd0e9b03a8c60dea8b
Signed-off-by: Paul Vinciguerra <pvinci@vinciconsulting.com>
diff --git a/src/tools/vppapigen/vppapigen.py b/src/tools/vppapigen/vppapigen.py
index 80097a1..c01fa40 100755
--- a/src/tools/vppapigen/vppapigen.py
+++ b/src/tools/vppapigen/vppapigen.py
@@ -450,7 +450,9 @@
         '''define : flist DEFINE ID '{' block_statements_opt '}' ';' '''
         # Legacy typedef
         if 'typeonly' in p[1]:
-            p[0] = Typedef(p[3], p[1], p[5])
+            self._parse_error('legacy typedef. use typedef: {} {}[{}];'
+                              .format(p[1], p[2], p[4]),
+                              self._token_coord(p, 1))
         else:
             p[0] = Define(p[3], p[1], p[5])