RM7213 Added IPPolicyCIDR.{first_ip, last_ip}

* Tested against production dbs.
* There was a bug in master when comparing it to the changes I had made, thus 2 commits instead of one (I had got the boolean sign wrong for allocated IPs). 

I don't believe you're confused. I'm pretty sure I'm confused. Alembic is new to me. So I'm guessing line 22 and a little bit further isn't a table declaration. Yup. Didn't know that.