Simple strategy to allow address pairs for virtual IP

Change-Id: I732d8700f7ca66cabc289d683c277b6c9b22616b

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+# Simple strategy to allow address pairs for virtual IP
+ 
+## Proposers
+
+- Gianpietro Lavado (Whitestack)
+- Gerardo García de Blas (Telefonica)
+
+## Type
+
+Feature
+
+## Target MDG/TF
+
+IM, RO
+
+## Description
+
+Openstack VIMs allow to ways to access virtual IPs inside VMs:
+1. Per-IP/MAC or prefix, with allow-address-pairs.
+2. Full access, by disabling port-security
+
+Today, OSM only supports the second one, which is not supported in some VIMs.
+As a different strategy to allow full access in these VIMs that do not support disabling port
+security, the proposal is to leverage allowed-address-pairs with a command like this one:
+
+openstack port set --allowed-address ip-address=0.0.0.0/0  PORT_ID
+
+This would not allow full access to the port, but would cover most cases where VIPs need
+to be reached.
+
+At the VNFD level, a new entry would need to be added, to support this different strategy of
+disabling port security.
+
+## Demo or definition of done
+
+- The VNFD supports a method of disabling port-security, through the use of allowed-address-pairs.
+- The ports are implemented with an allowed-address-pair rule that allows 0.0.0.0/0
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