Merge github.com:grpc/grpc into proto_names

Makefile

src/core/httpcli/httpcli_security_connector.c

src/core/iomgr/pollset_multipoller_with_poll_posix.c

src/core/security/client_auth_filter.c

src/core/security/credentials.c

src/core/security/security_connector.c

src/core/security/security_connector.h

src/core/surface/init.c

src/core/transport/static_metadata.c

src/core/transport/static_metadata.h

templates/Makefile.template

templates/test/core/end2end/end2end_defs.include

templates/test/core/end2end/end2end_nosec_tests.c.template

templates/test/core/end2end/end2end_tests.c.template

...s/test/core/surface/public_headers_must_be_c89.c.template

test/core/end2end/end2end_nosec_tests.c

test/core/end2end/end2end_tests.c

test/core/support/alloc_test.c

test/core/support/cpu_test.c

test/core/surface/public_headers_must_be_c89.c