Pipelimit on non-Linux: Repeating warning messages endlessly

[oej]

Pipelimit on non-Linux keeps complaining that it can't read files in /proc/net - repeatedly.

While one warning is a good one, repeating it and filling log files is not a good thing imho.

Tested with git head master

[oej]

This apply to the "statistics" module as well.

[oej]

2(91255) ERROR: ratelimit [ratelimit.c:330]: get_cpuload(): could not open /proc/stat
 2(91255) ERROR: <core> [statistics.c:385]: get_used_waiting_queue(): Could not open /proc/net/udp. kamailioMsgQueueDepth and its related alarms will not be available.
 2(91255) ERROR: <core> [statistics.c:385]: get_used_waiting_queue(): Could not open /proc/net/tcp. kamailioMsgQueueDepth and its related alarms will not be available.
 2(91255) ERROR: <core> [statistics.c:385]: get_used_waiting_queue(): Could not open /proc/net/tcp. kamailioMsgQueueDepth and its related alarms will not be available.
 2(91255) ERROR: <core> [statistics.c:385]: get_used_waiting_queue(): Could not open /proc/net/udp. kamailioMsgQueueDepth and its related alarms will not be available.
 2(91255) ERROR: <core> [statistics.c:385]: get_used_waiting_queue(): Could not open /proc/net/tcp. kamailioMsgQueueDepth and its related alarms will not be available.
 2(91255) ERROR: <core> [statistics.c:385]: get_used_waiting_queue(): Could not open /proc/net/tcp. kamailioMsgQueueDepth and its related alarms will not be available.

[oej]

And ratelimit

 2(91255) ERROR: ratelimit [ratelimit.c:330]: get_cpuload(): could not open /proc/stat

[oej]

I can take a look at this and do a fix similar to what was done in sipcapture

[oej]

Fixed in git head.