Unix resolver, bug fixes

BUILD

Makefile

build.json

gRPC.podspec

src/core/client_config/lb_policy.h

src/core/client_config/resolvers/unix_resolver_posix.c

src/core/client_config/resolvers/unix_resolver_posix.h

src/core/security/client_auth_filter.c

src/core/security/server_auth_filter.c

src/core/security/server_secure_chttp2.c

src/core/surface/init.c

src/core/surface/secure_channel_create.c

test/core/bad_client/bad_client.c

test/core/channel/channel_stack_test.c

test/core/client_config/uri_parser_test.c

test/core/end2end/fixtures/chttp2_fullstack_uds_posix.c

test/core/end2end/fixtures/chttp2_fullstack_with_poll.c

test/core/end2end/fixtures/chttp2_socket_pair.c

.../end2end/fixtures/chttp2_socket_pair_one_byte_at_a_time.c

...ore/end2end/fixtures/chttp2_socket_pair_with_grpc_trace.c