Update testfiledb sample and conddb tag

Hlt/Moore/doc/release.notes

@@ -4,6 +4,11 @@
 ! Purpose     : LHCb HLT application
 !============================================
 
+! 2016-05-24 - Rosen Matev
+ - Remove 2015 settings test
+ - Use test_file_db["2015NB_25ns_L0Filt0x1606"] everywhere
+ - Override conddb tag to make sure Herschel decoder works
+
 ! 2016-05-18 - Mika Vesterinen
  - Use the correct TCK in tests/options/TCK/TCKOptions.py