LFI Scanner : Improved apache log technique output + paths optimisation

The output has been improved by incorporating the start and end tags in
the eval() parameter.

The paths optimisation:
- removed some duplicate paths
- re-ordered the apache logs path in order of probable existence
- testing error logs first then access logs, we could remove access logs
  test and assume that they are in the same directory as the error log
  if we want an optimisation heuristic.