Remove unused FailfWithOffset()

The function has been unused from outside of e2e framework at all
since 30b3472 which added the function.
This removes it for code cleanup.

Author: Kenichi Omichi

test/e2e/framework/log.go

@@ -42,16 +42,11 @@ func Logf(format string, args ...interface{}) {
 	log("INFO", format, args...)
 }
 
-// Failf logs the fail info, including a stack trace.
+// Failf logs the fail info, including a stack trace starts at 2 levels above its caller
+// (for example, for call chain f -> g -> Failf("foo", ...) error would be logged for "f").
 func Failf(format string, args ...interface{}) {
-	FailfWithOffset(1, format, args...)
-}
-
-// FailfWithOffset calls "Fail" and logs the error with a stack trace that starts at "offset" levels above its caller
-// (for example, for call chain f -> g -> FailfWithOffset(1, ...) error would be logged for "f").
-func FailfWithOffset(offset int, format string, args ...interface{}) {
 	msg := fmt.Sprintf(format, args...)
-	skip := offset + 1
+	skip := 2
 	log("FAIL", "%s\n\nFull Stack Trace\n%s", msg, PrunedStack(skip))
 	e2eginkgowrapper.Fail(nowStamp()+": "+msg, skip)
 }

test/e2e/framework/log_test.go

@@ -110,9 +110,9 @@ func TestFailureOutput(t *testing.T) {
 		},
 		testResult{
 			name:    "[Top Level] log fails",
-			output:  "INFO: before\nFAIL: I'm failing.\n\nFull Stack Trace\nk8s.io/kubernetes/test/e2e/framework_test.glob..func1.2.1(...)\n\tlog_test.go:56\nk8s.io/kubernetes/test/e2e/framework_test.glob..func1.2()\n\tlog_test.go:57\nk8s.io/kubernetes/test/e2e/framework_test.runTests()\n\tlog_test.go:47" + commonOutput,
+			output:  "INFO: before\nFAIL: I'm failing.\n\nFull Stack Trace\nk8s.io/kubernetes/test/e2e/framework_test.glob..func1.2()\n\tlog_test.go:57\nk8s.io/kubernetes/test/e2e/framework_test.runTests()\n\tlog_test.go:47" + commonOutput,
 			failure: "I'm failing.",
-			stack:   "k8s.io/kubernetes/test/e2e/framework_test.glob..func1.2.1(...)\n\tlog_test.go:56\nk8s.io/kubernetes/test/e2e/framework_test.glob..func1.2()\n\tlog_test.go:57\nk8s.io/kubernetes/test/e2e/framework_test.runTests()\n\tlog_test.go:47\n",
+			stack:   "k8s.io/kubernetes/test/e2e/framework_test.glob..func1.2()\n\tlog_test.go:57\nk8s.io/kubernetes/test/e2e/framework_test.runTests()\n\tlog_test.go:47\n",
 		},
 	}
 	// Compare individual fields. Comparing the slices leads to unreadable error output when there is any mismatch.