Added venture and is_public columns to IPAddress

- Added venture column to IPAddress
- Added is_public column to IPAddress
- Added get_ip_addresses to pricing_api
- Auto detect if address is public or not
Fix migrations

- Remove needless changes in models
- Create new migration
Use ipaddr lib

- Use ipaddr lib instead manually solution
Added data migration

- Update is_public for exist addresses
get_ip_addresses returns list of ips and ventures

- get_ip_addresses returns list of ips and ventures
Return exchange for yield

- Return exchange for yield
Fix get_ip_addresses filtering by only_public

- get_ip_addresses filtering by only_public
Merge pull request #787 from kula1922/feature/add-venture-column-to-ip-address

Feature/add venture column to ip address