check_proftp_user

Plugin generally works, but exit codes are not correct, so it will show Warning in all cases.

To correct this, replace the code with:

if [ "$FTPUSER" -lt "$WARNLIMIT" ]
then
echo OK $FTPUSER logged in! "| $FTPUSER"
exit 0
elif [ "$FTPUSER" -ge "$WARNLIMIT" ] && [ "$FTPUSER" -lt "$CRITLIMIT" ]
then
echo WARNING $FTPUSER logged in! "| $FTPUSER"
exit 1
elif [ "$FTPUSER" -ge "$CRITLIMIT" ]
then
echo CRIRICAL $FTPUSER logged in! "| $FTPUSER"
exit 2

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