- fixes https://github.com/lbryio/lbry/issues/2244
- reduce the max DHT datagram size to 1400 bytes
- truncate `contacts` field of find_value response datagrams to the k closest (8)
- truncate peers in find_node response datagrams to the 2k closest (16)
- remove `contacts` field from find_value responses beyond `page` 0 (the first/default)
- deterministically shuffle the peers for a blob in a find_value response
- add optional `page` argument to `find_value` and `p` field to find_value responses containing the number of pages of k peers for the blob
- test one blob being announced by 150 different peers to one peer
- speed up pylint and remove some disabled checks
