Comment 2 for bug 1585056

Indeed, it looks like the squid3 snap is buggy:
```
ubuntu@localhost:~$ sudo squid3
Bad system call
ubuntu@localhost:~$ dmesg |tail -1
[ 2433.369346] audit: type=1326 audit(1464602357.655:49): auid=1000 uid=0 gid=0 ses=2 pid=4425 comm="squid" exe="/snap/squid3/3/sbin/squid" sig=31 arch=c000003e syscall=116 compat=0 ip=0x7f0733603f49 code=0x0
ubuntu@localhost:~$ scmp_sys_resolver 116
setgroups
```