chore(protocol): improve IPv6 address. (#268)

* docs: improve documentation and configuration handling

- Clarify valid values for the IP protocol in usage messages for both main application and proxy settings

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

* test: improve IPv6 command execution tests

- Add a new test function `TestCommandWithIPv6` to check command execution with an IPv6 address
- Initialize test variables and expected output for the IPv6 command test
- Set up a `Plugin` struct with IPv6 host, user, port, key path, script, and command timeout for testing
- Verify that `plugin.Exec()` returns `nil` (no error) in the IPv6 test
- Assert that the output of the command execution matches the expected output in the IPv6 test

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

* test: enhance test suite and CI robustness

- Add support for IPv6 protocol in `TestCommandWithIPv6` test case in `plugin_test.go`

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

* update

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

* update

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

* update

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

* update

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

* update2

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

* update3

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

* update4

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

* update5

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

* update5

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

* update5

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

---------

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

plugin.go

@@ -61,7 +61,9 @@ func escapeArg(arg string) string {
 func (p Plugin) hostPort(host string) (string, string) {
 	hosts := strings.Split(host, ":")
 	port := strconv.Itoa(p.Config.Port)
-	if len(hosts) > 1 {
+	if len(hosts) > 1 &&
+		(p.Config.Protocol == easyssh.PROTOCOL_TCP ||
+			p.Config.Protocol == easyssh.PROTOCOL_TCP4) {
 		host = hosts[0]
 		port = hosts[1]
 	}