Swap the order of input and reference file in regtest
Swap the order of input and reference file in diff in regtest. Also, update the message that is printed if the difference was found.
Example:
@@ -417,4 +420,4 @@
TrigSignatureMoniMT INFO -- #531141817 Features 0 - - - -
TrigSignatureMoniMT INFO HLT_xe65_cell_xe110_tcpufit_L1XE50 #115518400
-TrigSignatureMoniMT INFO -- #115518400 Events 20 20 - - - - - 0
-TrigSignatureMoniMT INFO -- #115518400 Features - - - - -
+TrigSignatureMoniMT INFO -- #115518400 Events 20 20 0 - - - - 0
+TrigSignatureMoniMT INFO -- #115518400 Features 0 - - - -
=== Alert! FAILURE input file (+) differs from reference (-)
Related to ATR-20955