Renamed new delegate connection classes.

.../com/oracle/truffle/r/runtime/conn/ConnectionSupport.java

...racle/truffle/r/runtime/conn/DelegateReadRConnection.java

.../truffle/r/runtime/conn/DelegateReadWriteRConnection.java

...acle/truffle/r/runtime/conn/DelegateWriteRConnection.java

...rc/com/oracle/truffle/r/runtime/conn/FifoConnections.java

...rc/com/oracle/truffle/r/runtime/conn/FileConnections.java

...rc/com/oracle/truffle/r/runtime/conn/PipeConnections.java

...src/com/oracle/truffle/r/runtime/conn/RawConnections.java

.../com/oracle/truffle/r/runtime/conn/SocketConnections.java

...rc/com/oracle/truffle/r/runtime/conn/TextConnections.java

...src/com/oracle/truffle/r/runtime/conn/URLConnections.java