Update IPAM_IP_POOL rows description

Update IPAM_IP_POOL rows description

For the self serve, in order to assign the proper prefix
id to resolve the ip address, the data dictionary will perform
lookup in the DB matching on the description field.
Here we're updating the description field to be a single
string, for vFW, we have:
- unprotected
- protected
- private

Change-Id: Ib6ade2f8d50e269a46042ea9df84b62924445223
Issue-ID: SDNC-444
Signed-off-by: Alexis de Talhouët <adetalhouet89@gmail.com>
Former-commit-id: 9e9460aae555e6085ac463f5caba27f5d9fc1e1c