* Add CopyrightHeader support for sbt-boilerplate plugin.
* Add CopyrightHeader support for `*.proto` files.
* Add regex match for both `–` and `-` for CopyrightHeader.
* Add CopyrightHeader support for sbt build files.
* Update copyright from 2018 to 2019.
* we don't want to include the full origin address in each message,
only the UID
* that means that the restarted receiving system can't initate a
new handshake immediately when it sees message from unknown origin
* instead we inject HandshakeReq from the sending system once in a while
(1 per second) which will trigger the new handshake
* any messages that arrives before the HandshakeReq are dropped, but
that is fine since the system was just restarted anyway
* note that the injected handshake is only done for active connections,
when a message is sent
* also changed the UID to a Long, but there are more places in old remoting
that must be changed before we actually can use a Long value
fix lost first message, #20566
* the first message was sometimes dropped by the InboundHandshake stage
because it came from unknown origin, i.e. the handshake had not completed
* that happended because the ordinary messagage arrived before the
first HandshakeReq, which may happen since we sent the HandshakeReq
over the control stream
* this changes so that HandshakeReq is sent over the same stream, not
only on the control stream and thereby the HandshakeReq will arrive
before any other message
* always send HandshakeReq as first message
* also when the handshake on sender side has been completed at startup
* moved code from preStart to onPull
* Disallow join requests when already part of a cluster
* Remove wipe state when joining, since join can only be
performed from empty state
* When trying to join, only accept gossip from that member
* Ignore gossips from unknown (and unreachable) members
* Make sure received gossip contains selfAddress
* Test join of fresh node with same host:port
* Remove JoinTwoClustersSpec
* Welcome message as reply to Join
* Retry unsucessful join request
* AddressUidExtension
* Uid in cluster Member identifier
To be able to distinguish nodes with same host:port
after restart.
* Ignore gossip with wrong uid
* Renamed Remove command to Shutdown
* Use uid in vclock identifier
* Update sample, Member apply is private
* Disabled config duration syntax and cleanup of io settings
* Update documentation
