fix auth

[LaoQi]

https://github.com/CodisLabs/redis-port/blob/a2e08c1edc05bdb7a2ad0ae29369f405f77eeaa1/cmd/libs.go#L41

u.User.String()

// String returns the encoded userinfo information in the standard form
// of "username[:password]".
func (u *Userinfo) String() string {
	if u == nil {
		return ""
	}
	s := escape(u.username, encodeUserPassword)
	if u.passwordSet {
		s += ":" + escape(u.password, encodeUserPassword)
	}
	return s
}

special characters will be escaped.

diff --git a/cmd/libs.go b/cmd/libs.go
index e8d6c7c..df29f80 100644
--- a/cmd/libs.go
+++ b/cmd/libs.go
@@ -38,7 +38,11 @@ func redisParsePath(path string) (addr, auth string) {
                log.PanicErrorf(err, "invalid redis address %q", path)
        }
        if u.User != nil {
-               return u.Host, u.User.String()
+               password, err := url.QueryUnescape(u.User.String())
+               if err != nil {
+                       log.PanicErrorf(err, "invalid redis password %q", path)
+               }
+               return u.Host, password
        } else {
                return u.Host, ""
        }