If enabled accel-pppd will not destroy interface immediately after corresponding session is terminated, instead interface will be brought down  and placed to cache for later use for new sessions.
     It should reduce kernel interface creation/deletion rate lack and increase responsibility of daemon

implemented connlimit module which can be used to reduce system overload due to flood of connections

This reverts commit ee41cba6.

update man page

pppoe: tr101 option to enable/disable tr101 handling

log_file: write authentication failed session logs to different file (optional)

This reverts commit f3d14bf9.