remove MTU from dynamic reconfigure (use GenICam feature for that)

[bmegli]

Related to:

• 24

• 25

There are now 5 ways to set MTU

• dynamic reconfigure
• rosparam
• GenICam GevSCPSPacketSize (deprecated)
• GenICamDeviceStreamChannelPacketSize
• above by integer service

The result is the same but they are at the same time "racing" for result.

If user sets it through GenICam and rosparam the outcome depends on the order of code lines in init.

[bmegli]

This is backed by GenICam.

No explicit code to support that is needed.

For maintenance and simplicity reasons all custom code should be removed.

This should also fix #25

If user is interested in setting MTU he can do it through rosparams in launchfile or using service

• GevSCPSPacketSize
• DeviceStreamChannelPacketSize