REGISTRAR: use parsed name when searching for similar users

- When searching for similar users (before new application approval)
  try to parse display/commonName in order to remove wrong input.
  Name titles are dropped from search to provide wider search results.
  If parsing name fails, log, ignore and try to search by whole input.
Merge pull request #137 from zlamalp/reg

REGISTRAR: use parsed name when searching for similar users