Revert "GDA-5992 if a motor limit is hit, use the LLS and HLS PVs to determine which one has been hit"

This reverts commit 03c59c78bce891c6b8debc04ec2392f5fb9ca047.

The changes in the reverted can cause a deadlock, preventing reads from
PVs on the IOC from GDA.

Conflicts:

	uk.ac.gda.epics/src/gda/device/motor/EpicsMotor.java
Add toString method to EpicsMotor

Originally from 03c59c78 (which has been reverted).