This spec proposes changes to Manila with the purpose of
addressing the need for having share servers with network
allocations on multiple subnets.
The spec is splitted in two phases, targeting to more
than one release:
1. Add ability to define multiple subnets in the same share network AZ
2. Add ability to "update" subnets in a share network AZ
Implements: bp multiple-subnet-share-servers
APIImpact
Change-Id: I080c083c5517c1b51eaf9fd328810df6aa97fe40