fix 1238: Allow individual cloud-init user-data at each VM

create individual user-data at each vm, parsing jinja2 with a
new OSM variable that includes known ip-address, mac-address,
vnf and ns id, vdu id and index, ...
Added OSM params at proxy charms

Change-Id: I3cb37d9c0d2816d89c55c7b2da2693992ed5dfb1
Signed-off-by: tierno <alfonso.tiernosepulveda@telefonica.com>