"arrayData" is not a valid units value
remove log message

This can be a very chatty message when used in conjunction with
LazyPVFactory.
removed unused private variables
Merge branch '8.34' of ssh://dascgitolite@dasc-git.diamond.ac.uk/gda/gda-epics.git into 8.34
Merge remote-tracking branch 'origin/8.34'