ping fails as a regular user on new VMs

the VMs set up on the gnt-fsn cluster seem to have a broken ping.

ping is not suid root nor is the cap set on at least web-fsn-02 and loghost01:

weasel@loghost01:~$ /sbin/getcap /usr/bin/ping 
weasel@loghost01:~$ 

meaning ping does not work as an unprivileged user:

weasel@loghost01:~$ ping localhost
ping: socket: Operation not permitted
e2:weasel@loghost01:~$ 

This could likely be fixed with re-installing iputils-ping or setting cap_net_raw+ep manually, but we should figure out why the instance-debbotstrap installed machines are broken this way.