New feature request: Enable dynamic connectivity setup in multi-site Network Services

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+# Enable dynamic connectivity setup in multi-site Network Services #
+
+## Proposer ##
+- Oscar Gonzalez de Dios (Telefonica)
+- Dimitrios Gkounis (University of Bristol)
+- Ramon Casellas (CTTC)
+- Rafael Alejandro Lopez da Silva (Telefonica)
+
+## Type ##
+**Feature**
+
+## Target MDG/TF ##
+IM-NBI, SO/LCM, RO
+
+## Description ##
+Current support of multi-site deployments in OSM assume that inter-DC
+connectivity is pre-provisioned. This feature tries to cover that gap to
+automate inter-DC network creation through a WIM that will cover not only the
+WAN deployments, but also will be extended to transport networks in general.
+
+In a multi-site environment, deployments are likely to be geographically
+distributed across different sites, interconnected through a (wide area)
+transport network. Until recently, provisioning connectivity across such a
+transport network has been done in a way that is decoupled from MANO
+orchestration and is taken as a static input from its point of view.
+
+For such scenarios, the dynamic provisioning of such a connectivity via OSM
+would be highly desirable, and it is in-line with  macroscopic ETSI NFV
+architecture that already includes the concept of WIM (WAN Infrastructure
+Manager), although the  applicability may not be limited to WAN deployments and
+be extended to transport networks in general.
+
+Such transport networks are expected to be SDN controlled. There are (often
+competing and overlapping) several alternatives in what concerns the  SDN NBI,
+including ONF TAPI (Transport API), IETF NBI models or the already existing
+APIs offered by major projects such as ONOS or ODL.
+
+The request is to extend OSM (either developing an additional OSM module or
+extending existing ones) to integrate the notion of WIM when a given network
+service is deployed in the aforementioned scenario (that is, with NSs that are
+deployed across multiple sites). It is thus expected that during the
+instantiation, OSM requests connectivity to one (or more) existing WIMs,
+implementing a SBI towards them using a plugin model.
+
+The feature thus encompases:
+- Identifying in which parts of OSM the concept of delegating connectivity to
+an external WIM is needed
+- Requesting connectivity to manage inter-DC links between VNFs
+
+ ## Demo or definition of done ##
+- Create a with a couple of VNFs (a single VDU would do).
+- Create a NSD that includes the two VNFs above and a link between them.
+- Instantiate the NSD in such a way that each VNF is placed in a different
+DC/VIM, so that the WIM has to create the connectivity between the 2 sites
+according to the specified link type and characteristics.
+- Check that both of them work properly and can be pinged.
+- It would be desirable to test this setup with different types of connectivity
+and VM interfaces supported by OSM:
+  - Connectivity: E-Line, E-LAN
+  - VM interfaces: VirtIO, passthrough, SR-IOV