DRILL-5098: Improving fault tolerance for connection between client and foreman node.
Adding tries config option in connection string. Improving fault tolerance in Drill client when trying to make first connection with foreman. The client will try to connect to min(tries, num_drillbits) unique drillbits unless a successfull connection is established.
HYGIENE: Refactoring BasicClient::close to call RemoteConnection::close
close apache/drill#679
