vppapigen: expose the values of per-message "options" in the api.json files

Also fix the vapi parser's assumption about what
the container with CRC is supposed to look like..

Change-Id: I3a23ef6c1502232742c03d227eb3654fb757709c
Type: improvement
Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>
diff --git a/src/tools/vppapigen/vppapigen_json.py b/src/tools/vppapigen/vppapigen_json.py
index 93ec21f..5fa839f 100644
--- a/src/tools/vppapigen/vppapigen_json.py
+++ b/src/tools/vppapigen/vppapigen_json.py
@@ -77,6 +77,7 @@
         if is_message and t.crc:
             c = {}
             c['crc'] = "{0:#0{1}x}".format(t.crc, 10)
+            c['options'] = t.options
             d.append(c)
 
         r.append(d)