[RTADPA BW Tests] Use new exp24 minbias for AllenInMoore_Hlt1_Bandwidth test

Standalone, is required by: lhcb-datapkg/PRConfig!358 (merged)

Updates Hlt1Conf/tests/options/bandwidth option files from the previous 'stand-in' input to the exp24 minbias.
Changes download_mdfs to instead be a wrapper of download_files, to allow addition of download_digis with little/no duplication.

Pending developments in PRConfig, this is ready.

Hlt/Hlt1Conf/tests/qmtest/test_AllenInMoore_hlt1_bandwidth_streamless.qmt

@@ -18,7 +18,7 @@ NB: If adding new config files (e.g. muon_geometry) please inform: @lugrazet or
 <argument name="timeout"><integer>3600</integer></argument>
 <argument name="args"><set>
   <text>$HLT1CONFROOT/tests/options/bandwidth/hlt1_bandwidth_input.py</text>
-  <text>$HLT2CONFROOT/tests/options/bandwidth/hlt1_bandwidth_streamless_streams.py</text>
+  <text>$HLT1CONFROOT/tests/options/bandwidth/hlt1_bandwidth_streamless_streams.py</text>
 </set></argument>
 <argument name="options"><text>
 from Configurables import HiveDataBrokerSvc
@@ -37,7 +37,7 @@ countErrorLines({"FATAL": 0, "ERROR": 0, "WARNING": 0},
                 stdout=remove_known_warnings(stdout))
 
 import re
-matches = re.findall('LAZY_AND: (Hlt2[A-Za-z0-9_]+) .*Sum=(\d+)', stdout)
+matches = re.findall('LAZY_AND: (Hlt1[A-Za-z0-9_]+) .*Sum=(\d+)', stdout)
 if not matches:
     causes.append('no line decisions found')