Virtual PC Descriptor

See merge request !118

(cherry picked from commit 74517831)

93f1539f Virtual PC Descriptor
a3376cdc Update hackfest_virtual-pc_vnfd/virtual-pc_vnfd.yaml
15bccf2b Deleted hackfest_virtual-pc_vnfd/charms/virtual-pc/hooks/install,...
5074ce34 Adding built charm
4e56134b Virtual PC NS Descriptor
a7fcf52d Fix no indicators on virtual-pc charm
a819702e Merge branch 'fix-virtual-pc-no-indicators' into 'beierlm-virtual-pc'

Changes the charm from relying on a prepackaged image to
building srsue and srsenb from tagged source.
Updates the descriptor to use generic name for relation.

Signed-off-by: beierlm <mark.beierl@canonical.com>

This adds the packages for the Squid Webserver
CNF which is used for the following Hackfest 9
sessions:
* Orchestrating a CNF (Juju part)
* Day 1-2 CNF Operations

Signed-off-by: Dominik Fleischmann <dominik.fleischmann@canonical.com>