Defining an installation prefix for grpc's root certs at compilation time.

Make interop server respond to sigint

This will allow the test to shut down cleanly, and avoid failing.

Removing the hardcoded SSL roots.

- Makes 2 tests fail:
  - httpcli_test
  - interop_test

C# renaming of VS projects and some cleanup

These invocation-side values allow users to choose
between synchronous and asynchronous execution of
their RPCs with a single attribute access.

Successful operations were leaking the thread used for expiration
monitoring. This change ensures that the ExpirationManager for the
operation always has its abort() method called when the
TerminationManager for the operation judges the operation to have
terminated.

remove prod_roots_certs.c

include .m in check_copyright.py

Ensure interop tests are run as part of run_tests

Fix server side large message receiving

I'm honestly a little shocked this wasn't done previously.

Make GRPC C core compile & run on 32 bit Ubuntu systems

The check for whether to request more data was all messed up.
On the client this needs to be after initial metadata is sent to guarantee that we have a live stream, but there's no such requirement at the server. Fix this.

I also ran clang-format across the code so there are some formatting changes.

Clean up Python C API use in src/python/src/grpc/_adapter/*.c.

 - Use METH_O and METH_NOARGS where appropriate, modifying the C functions
   appropriately.  METH_O is for functions that take a single PyObject, and
   it's passed directly instead of 'args'.  METH_NOARGS is for functions
   that take no arguments, and they get called with just one argument
   ('self'.)

 - In PyArg_ParseTuple*() calls, specify the callable's name for more
   descriptive exception messages.

 - For tp_init functions (which always take keyword arguments) introduce
   keyword argument parsing (using the C local variables as keywords,
   although I don't know if they're the best names to use.) This is mostly
   as a way to show how keyword arguments are done in C.  An alternative
   method is to use _PyArg_NoKeywords(kwds) (see
   https://hg.python.org/cpython/file/70a55b2dee71/Python/getargs.c#l1820,
   but unfortunately it's not part of the official API,) or check manually
   that the dict is empty.

 - Check the return value of Python API functions that can return an error
   indicator (NULL or -1.) PyFloat_AsDouble is also one of these, but we
   don't check the return type (we would have to compare the result to 1.0
   with ==, which is not a thing you should do) so just call PyErr_Occurred
   unconditionally.

 - Change Py_BuildValue() calls with just "O" formats into PyTuple_Pack
   calls.  It requires less runtime checking.

 - Replace Py_BuildValue()/PyObject_CallObject pairs with
   PyObject_CallFunctionObjArgs (since all of them have just PyObject*
   arguments.) If the Py_BuildValue formats had included other types,
   PyObject_CallFunction() would have been easier, but no need in these
   cases.

 - Replace Py_BuildValue("f", ...) with PyFloat_FromDouble(...). Less
   runtime checking and parsing necessary, and more obvious in what it does.

 - In the PyType structs, replace "PyObject_HEAD_INIT(NULL) 0" with
   "PyVarObject_HEAD_INIT(NULL, 0)".  Anything with an ob_size struct member
   is a PyVarObject, although the distinction isn't all that import; it's
   just a more convenient macro.

 - Assign tp_new in the PyType structs directly, like all other struct
   members, rather than right before the PyType_Ready() call.

 - Remove PyErr_SetString() calls in places that already have a (meaningful)
   exception set.

 - Add a PyErr_Format() for an error return that wasn't setting an exception
   (PyObject_TypeCheck() doesn't set an exception.)

 - Remove NULL assignments to struct members in the error paths of the
   tp_init functions.  PyObject structs are always zeroed after allocation,
   guaranteed.  (If there's a way for them to already contain an object
   you'd use Py_CLEAR() to clear them, but that can't happen in these
   cases.)

 - Remove a few unnecessary parentheses.

Revert "Adding a constant for a well known place where the SSL roots are...

Adding a constant for a well known place where the SSL roots are installed.

Some 32 bits platforms don't like buildint asm for openssl.