Go: all: T.FailNow used in goroutines in standard library tests

Per the documentation on testing.T, the methods FailNow, Fatal, Fatalf, SkipNow, Skip, and Skipf must be called from the same goroutine that is running the test. This requirement is violated by various tests in the standard library.

The following is a list of all goroutines spawned in tests that call T.FailNow. The list was generated from revision 2f49726.

src/runtime/chan_test.go:209:3
src/runtime/chan_test.go:306:4
src/runtime/chan_test.go:306:4
src/net/http/serve_test.go:2476:2
src/net/http/serve_test.go:2629:2
src/net/http/serve_test.go:2670:2
src/runtime/trace/trace_stack_test.go:85:2
src/runtime/trace/trace_test.go:256:2
src/runtime/trace/trace_test.go:256:2
src/runtime/trace/trace_test.go:256:2
src/database/sql/sql_test.go:2514:2
src/net/rpc/server_test.go:690:3
src/log/syslog/syslog_test.go:368:3
src/crypto/tls/handshake_server_test.go:201:2
src/crypto/tls/tls_test.go:294:2
src/crypto/tls/tls_test.go:294:2
src/sync/cond_test.go:135:2
src/sync/cond_test.go:162:2
src/sync/pool_test.go:121:3
src/net/dnsclient_unix_test.go:667:2
src/net/dnsclient_unix_test.go:667:2
src/net/dnsclient_unix_test.go:667:2
src/net/dnsclient_unix_test.go:667:2
src/sync/atomic/atomic_test.go:1216:3
src/sync/atomic/atomic_test.go:1216:3
src/sync/atomic/atomic_test.go:1259:3
src/sync/atomic/atomic_test.go:1259:3
src/sync/atomic/atomic_test.go:1305:3
src/sync/atomic/atomic_test.go:1353:3
src/os/exec/exec_test.go:431:2