return session_inflate_handle_invalid_stream(...) case is for streams
for INITIAL state, but this is rare case.  In general, we'd like to
reduce RST_STREAM transmission, and it is suffice to ignore this frame
for now.

https://datatracker.ietf.org/doc/draft-ietf-httpbis-legally-restricted-status/

This makes h2spec strict mode a bit happier.  We still one failing
test with h2spec -S (strict mode).

This is a short hand for --disable-app --disable-examples
--disable-hpack-tools --disable-python-bindings, for users who want to
build libnghttp2 only.

To allow the asio wrapper to work with boost.fiber it is required
to access the underlying io_service objects.

Previously, we only updated stream's weight field when only weight was
changed by PRIORITY frame.  If stream is queued, it would be better to
actually reschedule it based on new weight.  This could be especially
useful if weight is increased.

Previously, we updated descendant_last_cycle in
nghttp2_stream_reschedule, which is called after non-zero DATA frame.
But this was not optimal since we still had old descendant_last_cycle,
and new stream was scheduled based on it.  Now descendant_last_cycle
is updated in nghttp2_stream_next_outbound_item, which is called when
stream with highest priority is selected from queue.  And new stream
is scheduled based on it.  This commit also removes 0-reset of
descendant_last_cycle and cycle in nghttp2_stream_reschedule.  This
could help making them lower, so that they are not overflow.  But
there is a pattern that it doesn't work, and we are not sure they are
really useful at this moment.

Instead of using nonsensical large value for max outgoing concurrent
streams, use more sensible value, 100.