extend the register checker for block validation to more than one address. Now it's set up using pair of address and valid values stored in a dictionary to perform a loop for checks.

git-svn-id: https://svn.code.sf.net/p/tango-ds/code/DeviceClasses/AcceleratorComponents/LinacAlba/trunk@18273 3b39871e-fe4b-0410-b5db-e82997f68959