Fix #4234

*  update gopkg file to add sql dep

* Add LDAP Key Synchronization feature

Signed-off-by: Magnus Lindvall <magnus@dnmgns.com>

* Add migration: add login source id column for public_key table

* Only update keys if needed

* Add function to only list pubkey synchronized from ldap

* Only list pub ssh keys synchronized from ldap. Do not sort strings as ExistsInSlice does it.

* Only get keys belonging to current login source id

* Set default login source id to 0

* Some minor cleanup. Add integration tests (updete dep testify)

* dep: Update github.com/go-macaron/csrf

Update github.com/go-macaron/csrf with dep to revision 503617c6b372
to fix issue of csrf-token security.

This update includes following commits:
- Add support for the Cookie HttpOnly flag
- Support secure mode for csrf cookie

Signed-off-by: Aleksandr Bulyshchenko <A.Bulyshchenko@globallogic.com>

* routers: set csrf-token security depending on COOKIE_SECURE

Signed-off-by: Aleksandr Bulyshchenko <A.Bulyshchenko@globallogic.com>

* Update makefile to use dep

* Migrate to dep

* Fix some deps

* Try to find a better version for golang.org/x/net

* Try to find a better version for golang.org/x/oauth2