task/ta-npe-003-04 -- PrimaryElectDaemon validate MTS report
file

nparcel/b2cconfig.py
* new attribute pe_mts_filename_format which holds regular
  expression format string for Primary Elect MTS delivery

nparcel/conf/nparceld.conf
* placeholder for the new mts_filename_format config option

nparcel/primaryelectdaemon.py
* new method validate_file() parse the MTS-format filename string
  confirm that it validates