Changed the README file of PHP example

Change cancelled to cancelled?

Return success status of grpc_byte_buffer_reader_init

App to manually test behavior under changing connectivity conditions

Added missing dependencies to grpc++_base

Fix TSAN failure in tcp_server (shown via qps_openloop_test)

Merge branch 'protobuf-submodule-update' of https://github.com/nicolasnoble/grpc into bb_reader_error

Ruby garbage collection fixes

removed unused version of status_code_enum.h

Initialize variables in surface/call.c

Make running individual Python tests less painful

Change port_server.py to use port 32766

Merge branch 'complicated-syndrome-of-the-alien-kind' of https://github.com/soltanmm/grpc into bb_reader_error

Expunge all references to zookeeper

Add http2 status code in error_message if it's not 200

Contributed cmake project files.

Removed invalid sentence from interop flag description

We'll need to fix coverage testing in the future anyway (see #6894).

Before this change, running Python tests individually required
building a tox environment via the run_tests script and then specifying
long environment variables to filter out just the test we wanted to run
(and then we wouldn't be able to get the output on interrupt, nor would
we have an easy way of determining the PID of the process for debugger
attachment). Now invoking the build_python.sh script creates a workable
python virtual environment that includes all necessary libraries and
tests (s.t. running a single test is now possible by just knowing the
module name). This does not change existing supported means of running
tests (e.g. through run_tests.py).

An additional way of running individual tests has been introduced.
Following invocation of `./tools/run_tests/build_python.sh` (or
run_tests.py), one may invoke

  ./$VENV/bin/python -m $TEST_MODULE_NAME

and acquire a single running process that *is* the test process (rather
than a parent of the process). $VENV is the virtual environment name
specified to `build_python.sh` (defaults to `py27`) and
$TEST_MODULE_NAME is what it says on the tin.

Moves all tests into a separate package. This does not change existing
supported means of running tests (e.g. through run_tests.py).