support ipv6 in bind address

use split host port func instead trim specific character

add unit test for metrics and healthz bind address

recover import package

refactor set default kube proxy configuration

fix ipv4 condition

fix set default port condition

rewrite call function occasion to reduce error

set ipv6 default value

move get GetBindAddressHostPort to util

use one func to handle deprecated series

update bazel

define address type

return earlier in the error case

refactor set default kube proxy configuration logic

recover import package

preserve some of the original comments

add get default address func

add append port if needed unit test

rewrite unit test for deprecated flags

remove unused codes

pkg/proxy/util/utils.go

@@ -214,3 +214,24 @@ func filterWithCondition(strs []string, expectedCondition bool, conditionFunc fu
 	}
 	return corrects, incorrects
 }
+
+// AppendPortIfNeeded appends the given port to IP address unless it is already in
+// "ipv4:port" or "[ipv6]:port" format.
+func AppendPortIfNeeded(addr string, port int32) string {
+	// Return if address is already in "ipv4:port" or "[ipv6]:port" format.
+	if _, _, err := net.SplitHostPort(addr); err == nil {
+		return addr
+	}
+
+	// Simply return for invalid case. This should be caught by validation instead.
+	ip := net.ParseIP(addr)
+	if ip == nil {
+		return addr
+	}
+
+	// Append port to address.
+	if ip.To4() != nil {
+		return fmt.Sprintf("%s:%d", addr, port)
+	}
+	return fmt.Sprintf("[%s]:%d", addr, port)
+}