Introduce a Xferlog parser

Change-Id: I662435f51d0442d921ad8ec11671dbf632f7df28
Parse log, store in DB and view in GUI

Change-Id: I79342bdccd7b4efd0f5e9ebdbd1e54771efdcc55
Instructions to update logrotate configuration

Change-Id: Ic9be7e831869b5dfb4bd1db346f64d674a18ee66
Do not import the same log two times + report errors if any

Change-Id: I3afcb0c54980497e01974e780fa039393409c792
Merge remote-tracking branch 'gerrit/5696_see_proftpd_logs_in_project_admin' into tuleap-stable-master

* gerrit/5696_see_proftpd_logs_in_project_admin:
  Do not import the same log two times + report errors if any
  Instructions to update logrotate configuration
  Parse log, store in DB and view in GUI
  Introduce a Xferlog parser

Change-Id: Ib852965ba2263e67ecc263492be15bd93a01e5d2
Tuleap 6.9.99.7

Change-Id: I04a70f0fa908d11caac64c0f13927aa0b94f5738