Add an option to append the scan name to the user agent.

[CarsonHrusovsky]

Description
Which feature would you like to see added to BBOT? What are its use cases?

The use case for this would be scan correlation. For scanning a network, it can be useful to correlate findings by having a dynamic user agent. This can be accomplished today manually as by just deciding a scan name and then editing the config before running. However, having this automated would maintain the scan naming scheme for maximum fun.