Description of problem:
Our QAPI parser is a hack.  It works fine as long as the input is
within the hack's restrictions.  If not, it can crash, or screw up
silently.

I replaced it upstream:

f1a145e qapi.py: Permit comments starting anywhere on the line
28b8bd4 qapi.py: Rename expr_eval to expr in parse_schema()
5f3cd2b qapi.py: Fix diagnosing non-objects at a schema's top-level
6974ccd qapi.py: Fix schema parser to check syntax systematically
9213aa5 qapi.py: Reject invalid characters in schema file
2caba36 qapi.py: Decent syntax error reporting
c7a3f25 qapi.py: Restructure lexer and parser
4f193e3 tests: Use qapi-schema-test.json as schema parser test
9862657 tests: QAPI schema parser tests

I want this in RHEL-7 right away to give us decent error messages when
we change the QAPI schema, and to avoid silly conflicts.

How reproducible:
N/A

Steps to Reproduce:
N/A