* 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

* 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

Don't require token when not necessary