Change-Id: Ie23604c34ed9fb17eeb15bf73db9019ca9ebc7d8

Change-Id: Iba1604ee9c0b922b8fb7c6a278acf90d080a63e7

This is separate from the previous patch - it's just the results
of running the script so we can review the two a little independently.
We should probably squash them.

Change-Id: I838f15cf4a32455a5be20033c8ddc27db6ca15c0

As per the REST Networking API v2.0 (Subnet) docs, if subnets pools
are not specified, OpenStack networking automatically allocates pools
covering all IP addresses in the CIDR.

In custom vendor specific environments, subnets can be created without
allocation pools via UI due to which subnets will not have any existing
allocation pools. Under this scenario, module throws an
"IndexError: list index out of range" error.

Also, allow to add more allocation pools on top of existing allocation
pools.

Change-Id: Ib8becf5e958f1bc8e5c9fd76f1722536bf1c9f1a

Porting of job that was running on patches in Ansible.

Change-Id: Ifa5a6b40d6a0f1de9f2cbc917a55c2d0e8ac421d