Allow to specify management IP addresses as parameters at instantiation time

Change-Id: I404ffa48e8d84a566b3c3f211a436a138c852d93
Signed-off-by: tierno <alfonso.tiernosepulveda@telefonica.com>

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+# Allow to specify management IP addresses as parameters at instantiation time #
+ 
+## Proposer ##
+- Pablo Montes (Telefonica)
+- Antonio Lopez (Telefonica)
+- Gerardo Garcia (Telefonica)
+- Alfonso Tierno (Telefonica)
+- Francisco Javier Ramon (Telefonica)
+ 
+## Type ##
+**Feature**
+ 
+## Target MDG/TF ##
+IM-NBI, SO, RO
+ 
+## Description ##
+Having a management interface ready and reachable right after boot is critical 
+for driving Day 1 and Day 2 operations. Currently, OSM assumes that the VIM 
+assigns an IP address to the VNF from the pool in the management network (the 
+VNF can retrieve it via DHCP or metadata service, if available).
+ 
+However, many legacy OSS assume that the VNFs should have a specific IP address 
+assigned from a pool of addresses that they manage (or that they can learn from 
+other systems). In those cases, OSM should provide a means to be told, at the 
+time of instantiation, which management IP address should be used. Please note 
+that this address cannot be part of the VNFD or the NSD or, otherwise, several 
+instances of the VNF/NS would have the same IP address, leading to collisions, 
+etc.
+ 
+As a pre-requisite, OSM should provide a mean to specify parameters at the time 
+of instantiation.
+ 
+## Demo or definition of done ##
+- Create a NS with 2 VNFs, VNF-a and VNF-b.
+- Instantiate the NS in a site with a VIM, letting the VIM select the 
+management IP addresses. Check that both VNFs are reachable using the reported 
+IP addresses.
+- Instantiate the NS again, now setting the IP address of VNF-a to a specific 
+IP address (let VNF-b obtain the IP address from the VIM, as above). Then check 
+that both VNFs are reachable using the appropriate IP addresses (VNF-a at the 
+one requested; VNF-b at the one reported by OSM).