all: update stale test skips

Issues #10043, #15405, and #22660 appear to have been fixed, and
whatever tests I could run locally do succeed, so remove the skips.

Issue #7237 was closed in favor of #17906, so update its skip line.

Issue #7634 was closed as it had not appeared for over three years.
Re-enable it for now. An issue should be open if the test starts being
skipped again.

Change-Id: I67daade906744ed49223291035baddaad9f56dca
Reviewed-on: https://go-review.googlesource.com/121735
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/cmd/go/go_test.go

@@ -4008,8 +4008,6 @@ func TestCgoConsistentResults(t *testing.T) {
 		t.Skip("skipping because cgo not enabled")
 	}
 	switch runtime.GOOS {
-	case "freebsd":
-		testenv.SkipFlaky(t, 15405)
 	case "solaris":
 		testenv.SkipFlaky(t, 13247)
 	}

src/net/http/serve_test.go

@@ -2988,7 +2988,7 @@ func testRequestBodyLimit(t *testing.T, h2 bool) {
 // side of their TCP connection, the server doesn't send a 400 Bad Request.
 func TestClientWriteShutdown(t *testing.T) {
 	if runtime.GOOS == "plan9" {
-		t.Skip("skipping test; see https://golang.org/issue/7237")
+		t.Skip("skipping test; see https://golang.org/issue/17906")
 	}
 	defer afterTest(t)
 	ts := httptest.NewServer(HandlerFunc(func(w ResponseWriter, r *Request) {}))

src/net/http/transport_test.go

@@ -21,7 +21,6 @@ import (
 	"errors"
 	"fmt"
 	"internal/nettrace"
-	"internal/testenv"
 	"io"
 	"io/ioutil"
 	"log"
@@ -2726,7 +2725,6 @@ func TestTransportTLSHandshakeTimeout(t *testing.T) {
 // Trying to repro golang.org/issue/3514
 func TestTLSServerClosesConnection(t *testing.T) {
 	defer afterTest(t)
-	testenv.SkipFlaky(t, 7634)
 
 	closedc := make(chan bool, 1)
 	ts := httptest.NewTLSServer(HandlerFunc(func(w ResponseWriter, r *Request) {

src/time/sleep_test.go

@@ -425,10 +425,6 @@ func TestOverflowSleep(t *testing.T) {
 // Test that a panic while deleting a timer does not leave
 // the timers mutex held, deadlocking a ticker.Stop in a defer.
 func TestIssue5745(t *testing.T) {
-	if runtime.GOOS == "darwin" && runtime.GOARCH == "arm" {
-		t.Skipf("skipping on %s/%s, see issue 10043", runtime.GOOS, runtime.GOARCH)
-	}
-
 	ticker := NewTicker(Hour)
 	defer func() {
 		// would deadlock here before the fix due to