[core] remove useless static methods

Signed-off-by: Pierre Mazière <pierre.maziere@gmx.com>

lib/Bridge.php

@@ -262,7 +262,7 @@ class Bridge{
     * @return Bridge object dedicated
     */
     static public function create($nameBridge){
-        if( !static::isValidNameBridge($nameBridge) ){
+        if( !preg_match('@^[A-Z][a-zA-Z0-9-]*$@', $nameBridge)){
             throw new \InvalidArgumentException('Name bridge must be at least one uppercase follow or not by alphanumeric or dash characters.');
         }
 
@@ -303,10 +303,6 @@ class Bridge{
         return $dirBridge;
     }
 
-    static public function isValidNameBridge($nameBridge){
-        return preg_match('@^[A-Z][a-zA-Z0-9-]*$@', $nameBridge);
-    }
-
     /**
     * Lists the available bridges.
     * @return array List of the bridges