Re-run generate-projects

Check the length of unix socket path name 

Large message benchmarks

Re-integrate metadata handling changes

Add "Running test:" string to test log output

Accept max message size JSON values as either strings or numbers.

Remove double-checking of max-message-size in C++ layers

PHP: Update the visibility property  of method

PHP: fix code style

Remove slice allocator completion callbacks from global combiner

Consume the correct event fd

Move parameters for all grpc_op types into their own sub-structs.

These were never intended to be under that lock, and doing so can (sometimes) flatten our concurrency back to a single thread.

add http2 interop tests to Jenkins

Fixed stream ref issue on exhausted outgoing flow ctrl window