Validate computed hlq in common backend script

[dennis-behm]

A substring of the application name is used. A check needs to be added to avoid characters that are invalid for the z/OS dataset names.

dbb/Templates/Common-Backend-Scripts/utilities/dbbzBuilderUtils.sh

Lines 24 to 25 in 5b80078

	# Compute HLQ preix and application name
	HLQ=$(echo ${HLQPrefix}.${App:0:8} | tr '[:lower:]' '[:upper:]' | tr -d '-')