Bug 1254 - Finished MultipartReplyTranslator tests

 - added tested method in javadoc
 - renamed existing MultipartReplyTranslator tests with name ending with number
   as those tests were not included in Sonar analysis
 - contains TODO for MeterConfig case - missing flags translation and also
   prec_level for DscpRemark band type

Change-Id: I72610f31bc0ba8991564e90b142f19d4b54ef65f
Signed-off-by: Michal Polkorab <michal.polkorab@pantheon.sk>