Launch camera based on port number (or model)

[doisyg]

Currently, the only way to distinguish which camera to use in a multi camera/multi model configuration is to use the serial number of the camera device. This is not easy to maintain.
Would it be possible to use the camera1_usb_port_id as in the legacy package?

realsense-ros/realsense_camera/launch/r200_nodelet_multiple_cameras.launch

Lines 18 to 26 in ebc06d4

	<group ns="$(arg camera1)">
	<include file="$(find realsense_camera)/launch/includes/nodelet.launch.xml">
	<arg name="manager" value="/$(arg manager)" />
	<arg name="camera" value="$(arg camera1)" />
	<arg name="camera_type" value="$(arg camera1_camera_type)" />
	<arg name="serial_no" value="$(arg camera1_serial_no)" />
	<arg name="usb_port_id" value="$(arg camera1_usb_port_id)" />
	</include>
	</group>

In addition having a filter based on the camera model to be able to launch concurrently a D435 and a T265 without using serial numbers.

[doronhi]

Added option in #966, #964, #960.

[RealSenseCustomerSupport]

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Hi @doisyg, Do you need further help on this?
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