Add NODE_BLOOM service bit and bump protocol version

Lets nodes advertise that they offer bloom filter support explicitly.
The protocol version bump allows SPV nodes to assume that NODE_BLOOM is
set if NODE_NETWORK is set for pre-70002 nodes.

Also adds an undocumented option to turn bloom filter support off and
immediately kick peers that attempt to use bloom filters for testing
purposes. In addition a number of DoS attacks are made significantly
easier by bloom support, so having an option makes it easy to take
immediate steps in the event of an attack.