Drop validation.IsValidSocketAddr

It's not used anywhere, and if someone was going to validate an
IP:port somewhere, they should think about exactly what they want
rather than just using this function. (E.g., validation should be
slightly different for an IP:port to bind to vs an IP:port to connect
to.)

staging/src/k8s.io/apimachinery/pkg/util/validation/validation.go

@@ -19,9 +19,7 @@ package validation
 import (
 	"fmt"
 	"math"
-	"net"
 	"regexp"
-	"strconv"
 	"strings"
 
 	"k8s.io/apimachinery/pkg/util/validation/field"
@@ -493,18 +491,3 @@ func hasChDirPrefix(value string) []string {
 	}
 	return errs
 }
-
-// IsValidSocketAddr checks that string represents a valid socket address
-// as defined in RFC 789. (e.g 0.0.0.0:10254 or [::]:10254))
-func IsValidSocketAddr(value string) []string {
-	var errs []string
-	ip, port, err := net.SplitHostPort(value)
-	if err != nil {
-		errs = append(errs, "must be a valid socket address format, (e.g. 0.0.0.0:10254 or [::]:10254)")
-		return errs
-	}
-	portInt, _ := strconv.Atoi(port)
-	errs = append(errs, IsValidPortNum(portInt)...)
-	errs = append(errs, IsValidIP(ip)...)
-	return errs
-}

staging/src/k8s.io/apimachinery/pkg/util/validation/validation_test.go

@@ -710,31 +710,3 @@ func TestIsDomainPrefixedPath(t *testing.T) {
 		}
 	}
 }
-
-func TestIsValidSocketAddr(t *testing.T) {
-	goodValues := []string{
-		"0.0.0.0:10254",
-		"127.0.0.1:8888",
-		"[2001:db8:1f70::999:de8:7648:6e8]:10254",
-		"[::]:10254",
-	}
-	for _, val := range goodValues {
-		if errs := IsValidSocketAddr(val); len(errs) != 0 {
-			t.Errorf("expected no errors for %q: %v", val, errs)
-		}
-	}
-
-	badValues := []string{
-		"0.0.0.0.0:2020",
-		"0.0.0.0",
-		"6.6.6.6:909090",
-		"2001:db8:1f70::999:de8:7648:6e8:87567:102545",
-		"",
-		"*",
-	}
-	for _, val := range badValues {
-		if errs := IsValidSocketAddr(val); len(errs) == 0 {
-			t.Errorf("expected errors for %q", val)
-		}
-	}
-}