Related pull request: #2481 written by @nmittler
Motivation:
Some tests were still sending requests from the test thread rather than
from the event loop.
Modifications:
- Modified the roundtrip tests to use a new utility Http2TestUtil to
perform the write operations in the event loop thread.
- Modified the Http2Client under examples to write all requests in the
event loop thread.
- Added HttpPrefaceHandler and its test which were missing.
- Fixed various inspector warnings
Result:
Tests and examples now send requests in the correct thread context.
cea3b6b2ab