exscript: Improved cleanup of telnet buffer for HPProCurve driver.
Revert "exscript: Improved cleanup of telnet buffer for HPProCurve driver."

This reverts commit e437b25d079ebf9d8acae405209cabe82f254e50.
Exscript: Refactoring: Better cleanup for HP driver.
Exscript: Fixed bug: Bad escaping in regexp used for cleaning output.
Exscript: Improved cleaning function in telnetlib and for hp_pro_curve driver.
Exscript: Fixed bug: Unpack values after cleaning response for SSH2 protocol.
Exscript/drivers: Changed priviliged level for Junos ERX driver to 15.
Exscript: Driver junos_erx: Changed terminal initialisation.
arbor driver: support for new arbor devices.
add test for new arbor devices.