Contribute a Wireshark plugin for decrypting and dissecting
hashicorp/memberlist messages. And contribue a plugin for dissecting the
NetworkDB messages transported as memberlist User messages.
Add a feature to NetworkDB to log the encryption keys to a file for the
Wireshark memberlist plugin to consume, configured using an environment
variable.
Signed-off-by: Cory Snider <csnider@mirantis.com>
