New version of grpclb end2end test

CMakeLists.txt

Makefile

build.yaml

...core/ext/filters/client_channel/lb_policy/grpclb/grpclb.c

test/core/client_channel/resolvers/BUILD

test/core/end2end/fake_resolver.c

test/core/end2end/fake_resolver.h

test/cpp/end2end/BUILD

test/cpp/end2end/grpclb_end2end_test.cc

tools/run_tests/generated/sources_and_headers.json

tools/run_tests/generated/tests.json

...proj/test/grpclb_end2end_test/grpclb_end2end_test.vcxproj

...t/grpclb_end2end_test/grpclb_end2end_test.vcxproj.filters