When serveral targets were set in the widget file, the
framework allocated the same HTTP port to each. This
lead to impossibility to run all targets or to a
systemd conflict.
This should fix the issue by allocating an HTTP port for
each target installed by the widget. To achieves that goal,
the afm-unit.conf tag for the port is moved from
'#metadata.http-port' to '#metatarget.http-port'.
Bug-AGL: SPEC-2068
Change-Id: I5376d6f052e0ffc5c77cc80041528637777aed1e
Signed-off-by: José Bollo <jose.bollo@iot.bzh>