json_run_localhost infrastructure failures

[markdroth]

https://source.cloud.google.com/results/invocations/8cc2e1a0-9bb8-4e99-b709-c23030ab45ab/targets/github%2Fgrpc%2Fcpp_linux_tsan_native_x64_clang7.0/tests

The logs are full of messages like the following:

I0222 19:36:06.702665698   21211 subchannel.cc:960]          Connect failed: {"created":"@1550864166.702421298","description":"Failed to connect to remote host: Connection refused","errno":111,"file":"src/core/lib/iomgr/tcp_client_posix.cc","file_line":207,"os_error":"Connection refused","syscall":"connect","target_address":"ipv6:[::1]:27162"}

[markdroth]

Vijay, any idea what's going on with this? These tests have been timing out a lot lately.

[stale]

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