moves doRpc to RpcOverAmqp (and renames Settings.AMQPConn -> Settings AmqpConn)

data-access/servlet/src/main/java/cutout/CutoutImpl.java

data-access/servlet/src/main/java/cutout/DatasetsAmqp.java

data-access/servlet/src/main/java/cutout/RpcOverAmqp.java

data-access/servlet/src/main/java/webapi/Settings.java