Use only fully qualified namespaces for rpc input methods generation

Author: ablagoev

library/DrSlump/Protobuf/Compiler/PhpGenerator.php

@@ -399,7 +399,7 @@ protected function compileService(proto\ServiceDescriptorProto $service, $ns)
         $s[]= '     * @param ' . $this->normalizeNS($method->getInputType()) . ' $input';
         $s[]= '     * @return ' . $this->normalizeNS($method->getOutputType());
         $s[]= '     */';
-        $s[]= '    public function ' . $method->getName() . '(' . $this->normalizeNS($method->getInputType()) . ' $input);';
+        $s[]= '    public function ' . $method->getName() . '(\\' . $this->normalizeNS($method->getInputType()) . ' $input);';
         $s[]= '';
         endforeach;
         $s[]= '  }';