drop implicitly included use of boost _1

The symbol was included through ros_comm,
but ROS-O plans to change that include due to excessive deprecation warnings:
ros-o/ros_comm#3

Lambdas should be preferred over bind these days.

openni_camera/src/nodelets/driver.cpp

@@ -88,7 +88,7 @@ void DriverNodelet::onInit ()
 
   // Initialize dynamic reconfigure
   reconfigure_server_.reset( new ReconfigureServer(param_nh) );
-  reconfigure_server_->setCallback(boost::bind(&DriverNodelet::configCb, this, _1, _2));
+  reconfigure_server_->setCallback([this](auto cfg, uint32_t lvl){ configCb(cfg, lvl); });
 
   // Setting up device can take awhile but onInit shouldn't block, so we spawn a
   // new thread to do all the initialization