[wip] Identity keystone v3 projects basic CRUD

[kwapik]

No description provided.

[jrperritt]

Instead of having a struct parameter here, let's use an interface like the other services. For an example, see here: https://github.com/rackspace/gophercloud/blob/master/openstack/networking/v2/networks/requests.go#L127

[kwapik]

Thanks for commenting. I'll implement changes near the end of the week.

[kwapik]

@jrperritt Sorry for the big delay, I had a lot of other work.

To sum up what I've done:

• Applied your suggestions (changed Opts structs to interfaces, added some comments).
• Changed Update http method from PUT to PATCH (had to add PATCH method to client).
• Fixed tests.

[kaccardi]

@kwapik are you planning to continue to work on the PR on the new repo?

[kwapik]

@kaccardi I'm afraid that I won't have time to continue this within next few months

[coveralls]

Coverage increased (+0.005%) to 80.498% when pulling fb8ac8f on kwapik:identity-keystone-v3-projects into e00690e on rackspace:master.