re-instate connect behavior in DS so killed nodes re-connect, amend #2675
fix unexpected null parameter to disconnect, closes, #2663
fix a typo in DomainServer.cpp
move DTLS socket changes to LimitedNodeList
take pointer of optValue and not actual optValue
fix a debug line in LimitedNodeList
add a missing bracket to IP_DONTFRAG
Merge pull request #2676 from birarda/authentication

re-instate DS connect behavior