Add net2 debug option

[rebroad]

I often want to enable net debugging, but currently it's too noisy for what I want. Move some of the more verbose net debugging messages to "net2", making "net" debugging more likely to be desired without being too verbose (like this description!).

[jonasschnelli]

I think this makes sense. Although it would remove certain log output if people continue to use only debug=net. But IMO thats okay.
I personally would prefer something like debug=netverbose instead of net2.

[laanwj]

I personally would prefer something like debug=netverbose instead of net2.

Agreed

[paveljanik]

Concent ACK.
I too prefer netverbose.

[laanwj]

@rebroad can you please update the name of the debug category, then we can get this merged.

[morcos]

LogPrint("net", "dropmessages DROPPING SEND MESSAGE\n"); at line 2492 should probably also be moved to the new category.

Also maybe out of scope for this PR but the debug logging around "received getdata" seems due for a cleanup.

[laanwj]

Ping @rebroad

[laanwj]

Closing due to inactivity.