Option which allows the connection to remain open after executing

`remote_execute` closes the connection after each command is run.

Allow, possibly through a keyword argument to `remote_execute()`, that connection to remain
open after the command is run, since the caller may have logic that reads the output which determines
whether subsequent calls will be made. In this case, the caller will become responsible for closing the
connection.

** If possible, implement logic that will help the connection realize whether something has gone wrong and close itself.