Fix warnings with GCC 7.

[admcrae]

This fixes various warnings that I got with GCC 7.1.1.

Note that the changes to src/core/tsi/ssl_transport_security.c are only relevant for OpenSSL 1.1 (#10589); this change alone will not let it compile with OpenSSL 1.1, but it will compile after #11495 and #11496 are merged.

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[grpc-kokoro]

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[grpc-kokoro]

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[grpc-kokoro]

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[grpc-kokoro]

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[grpc-kokoro]

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[grpc-kokoro]

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[NanXiao]

Can anyone merge this commit into master, since it will cause build error on ArchLinux:

$ make
[MAKE]    Generating cache.mk
[C]       Compiling src/core/ext/transport/cronet/transport/cronet_transport.c
src/core/ext/transport/cronet/transport/cronet_transport.c: In function ‘create_grpc_frame’:
src/core/ext/transport/cronet/transport/cronet_transport.c:653:10: error: conversion to ‘uint8_t {aka unsigned char}’ from ‘int’ may alter its value [-Werror=conversion]
   *p++ = (flags & GRPC_WRITE_INTERNAL_COMPRESS) ? 1 : 0;
          ^
cc1: all warnings being treated as errors
make: *** [Makefile:2517: /home/xiaonan/Project/grpc/objs/opt/src/core/ext/transport/cronet/transport/cronet_transport.o] Error 1

[a11r]

Closing because obsolete.

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