* move sdk structs to moduels/structs

* fix tests

* fix fmt

* fix swagger

* fix vendor

1. A key can either be an ssh user key or a deploy key. It cannot be both.
2. If a key is a user key - it can only be associated with one user.
3. If a key is a deploy key - it can be used in multiple repositories and the permissions it has on those repositories can be different.
4. If a repository is deleted, its deploy keys must be deleted too.

We currently don't enforce any of this and multiple repositories access with different permissions doesn't work at all. This PR enforces the following constraints:

- [x] You should not be able to add the same user key as another user
- [x] You should not be able to add a ssh user key which is being used as a deploy key
- [x] You should not be able to add a ssh deploy key which is being used as a user key
- [x] If you add an ssh deploy key to another repository you should be able to use it in different modes without losing the ability to use it in the other mode.
- [x] If you delete a repository you must delete all its deploy keys.

Fix #1357

* Add private information to the deploy keys api

This commit adds more information to the deploy keys to allow for back
reference in to the main keys list. It also adds information about the
repository that the key is referring to.

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Add private information to the user keys API

This adjusts the keys API to give out private information to user keys if
the current user is the owner or an admin.

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Add ability to search keys by fingerprint

This commit adds the functionality to search ssh-keys by fingerprint of
the ssh-key. Deploy keys per repository can also be searched. There is
no current clear API point to allow search of all deploy keys by
fingerprint or keyID.

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Add integration test

* Fix Swagger JSON.

Remove unnecessary schema references for the forbidden and empty responses

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Fix swagger API for CreateAccessToken

* Fix admin create org swagger

* Fix swagger for adminCreateRepo

* More swagger fixes

Set int64 format for those which are int64
Some more form fixes

* Fix swagger description of GET /repos/{owner}/{repo}/pulls

* Add is_writable checkbox to deploy keys interface

* Add writable key option to deploy key form

* Add support for writable ssh keys in the interface

* Rename IsWritable to ReadOnly

* Test: create read-only and read-write deploy keys via api

* Add DeployKey access mode migration

* Update gitea sdk via govendor

* Fix deploykey migration

* Add unittests for writable deploy keys

* Move template text to locale

* Remove implicit column update

* Remove duplicate locales

* Replace ReadOnly field with IsReadOnly method

* Fix deploy_keys related integration test

* Rename v54 migration with v55

* Fix migration hell

* Update swagger documentation

Add docs for missing endpoints
Add documentation for request parameters
Make parameter naming consistent
Fix response documentation

* Restore delete comments

* golint fixed for modules/setting

* typo fixed and renamed UNIXSOCKET to UnixSocket

From code.gitea.io/go-sdk/gitea
  To code.gitea.io/sdk/gitea

- Update import paths from github.com/go-gitea to code.gitea.io
- Fix import path for travis

See https://docs.travis-ci.com/user/languages/go#Go-Import-Path

- Fix go-gogs-client#10
- Related to #809