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* Fix a potential crash if the gateway IP was the last available IP of
the subnet
* Create the corresponding test

* Fix a bug where snf-manage subnet-list printed deleted subnets too
* Fix a query, that also returned deleted subnets

* Fix a bug if the user specified no allocation pools
* Fix a wrong error message in logic/subnets.py

* Add a function in logic/subnets.py that parses allocation pools
* Add a new option in snf-manage network-create for allocation pools
* Update subnet-create to use the new function

* Return subnets from public networks, in GET subnets
* Fix a bug in list ports, where only attached ports to servers were
listed

* Remove unused functions and imports from logic/subnets.py
* Remove --network-id option from snf-manage subnet-modify and make
it an argument
* Fix --ip-version, --dhcp and --gateway options in snf-manage
subnet-create
* Move some code from logic/subnets.py to api/subnets.py
* Refactor the way we handle the gateway IP
* s/slac/slaac/g

* Fix IP pools of subnets to take into account the 'offset' when searching
if a pool contains an IP address and when converting from value to index
and from index to value.
* Fix the way subnets are created from 'logic/networks'
* Rename 'validate_network_params' function to 'validate_subnet_params'
  and move it from 'networks' to 'subnets' packages.

* Fix a bug, where a user could change the name of a subnet without
being the owner of said subnet.
* Fix two bugs in snf-manage subnet-create. Fix no-dhcp option and a
potential crash if the user specified an invalid IP version type.
* Fix a bug in logic/subnets.py, where if the user specified a gateway
IP, the program crashed.

* Update docstrings in api/subnets.py and logic/subnets.py
* Remove duplicate and unused functions from logic/subnets.py

Move api/subnets.py to logic/subnets.py, for further code refactoring

IPv6 subnets now support a boolean attribute called slac.
If a request for a subnet contains both a slac field and an enable_dhcp
field, only the slac one will be used. If no slac field is found for an
IPv6 subnet, the field enable_dhcp will be used instead.

IPv4 subnets silently ignore any slac field if present and only use
enable_dhcp.

This commit adds the relevant tests in tests/subnets.py too.

Update subnets.py to use the two functions introduced in commit 2a1e6fb

Commit 4e3a667 introduced a new model for Subnets, this commit contains
the following changes:

* Update api/subnets.py to match the new model
* Create tests/subnets.py to test the above api calls
* Update api/urls and tests/__init__.py to reflect the above changes