Possibly enhanced network_problem custom plugin

My comment was eaten by github in !152 and wanted to raise attention incase this was meant to be an exit instead of an echo, otherwise feel free to close!

Author: r4j4h

config/plugin/network_problem.sh

@@ -7,8 +7,8 @@ OK=0
 NONOK=1
 UNKNOWN=2
 
-[ -f /proc/sys/net/ipv4/netfilter/ip_conntrack_max ] || echo $UNKNOWN
-[ -f /proc/sys/net/ipv4/netfilter/ip_conntrack_count ] || echo $UNKNOWN
+[ -f /proc/sys/net/ipv4/netfilter/ip_conntrack_max ] || exit $UNKNOWN
+[ -f /proc/sys/net/ipv4/netfilter/ip_conntrack_count ] || exit $UNKNOWN
 
 conntrack_max=$(cat /proc/sys/net/ipv4/netfilter/ip_conntrack_max)
 conntrack_count=$(cat /proc/sys/net/ipv4/netfilter/ip_conntrack_count)