[quagga] enable core dump for bgpd and zebra (#927)

* [core dump] pass unix time to coredump-compress script

Currently we only have program name (e.g. bgpd) and PID in the core file
name. PID could collide especially after docker restart or recreate.

Passing the unix time to coredump-compress so it could also add time to
the core file name.

* [utilities] include the change to coredump_compress script

* [quagga] enable core dump for bgpd and zebra

bgpd and zebra downgrade their privilege shortly after started. For that
sysctrl kernel.suid_dumpable needs to be set to 2, so that they can dump
core.

Note that fs.suid_dumpable SHOULD NOT be set to 1. Which will bypass all
system security.

Author: yxieca

build_debian.sh

@@ -239,10 +239,11 @@ EOF
 ## Config sysctl
 sudo mkdir -p $FILESYSTEM_ROOT/var/core
 sudo augtool --autosave "
-set /files/etc/sysctl.conf/kernel.core_pattern '|/usr/bin/coredump-compress %e %p'
+set /files/etc/sysctl.conf/kernel.core_pattern '|/usr/bin/coredump-compress %e %t %p'
 
 set /files/etc/sysctl.conf/kernel.softlockup_panic 1
 set /files/etc/sysctl.conf/kernel.panic 10
+set /files/etc/sysctl.conf/fs.suid_dumpable 2
 
 set /files/etc/sysctl.conf/net.ipv4.conf.default.forwarding 1
 set /files/etc/sysctl.conf/net.ipv4.conf.all.forwarding 1