Use the 80 port with keyserver.ubuntu.com

Use the 80 port with keyserver.ubuntu.com so it works with corporate firewalls
Use /proc/mounts instead of mount(8)

Specifically, Ubuntu Precise's cgroup-lite script uses mount -n
to mount the cgroup filesystems so they don't appear in mtab, so
detection always fails unless the admin updates mtab with /proc/mounts.

/proc/mounts is valid on just about every Linux machine in existence and
as a bonus is much easier to parse.

I also removed the regex in favor of a more accurate parser that should
also support monolitic cgroup mounts (e.g. mount -t cgroup none /cgroup).
Improve crashTest
Merge pull request #488 from tobert/cgroups-via-proc-mounts

* runtime: Use /proc/mounts instead of mount(8)
Merge pull request #485 from brunoqc/patch-1

* Packaging: connect to Ubuntu key server on port 80