This reverts commit 475febd0.

* go1.9.3:
  tech: upgrade to golang 1.9.3

* options.scopedVars was called without 'd', so a undefined was passed
  to the function convertDimensionFormat()

* db: add login attempt migrations

* db: add possibility to create login attempts

* db: add possibility to retrieve login attempt count per username

* auth: validation and update of login attempts for invalid credentials

If login attempt count for user authenticating is 5 or more the last 5 minutes
we temporarily block the user access to login

* db: add possibility to delete expired login attempts

* cleanup: Delete login attempts older than 10 minutes

The cleanup job are running continuously and triggering each 10 minute

* fix typo: rename consequent to consequent

* auth: enable login attempt validation for ldap logins

* auth: disable login attempts validation by configuration

Setting is named DisableLoginAttemptsValidation and is false by default
Config disable_login_attempts_validation is placed under security section
#7616

* auth: don't run cleanup of login attempts if feature is disabled

#7616

* auth: rename settings.go to ldap_settings.go

* auth: refactor AuthenticateUser

Extract grafana login, ldap login and login attemp validation together
with their tests to separate files.
Enables testing of many more aspects when authenticating a user.
#7616

* auth: rename login attempt validation to brute force login protection

Setting DisableLoginAttemptsValidation => DisableBruteForceLoginProtection
Configuration disable_login_attempts_validation => disable_brute_force_login_protection
#7616

* Fix typeahead to not generate new request on each keypress.

* Change to debounce method

fixes broken phantomjs rendering

when migrating from govendor to dep we broke the phantomjs rendering.

ref #10602

* Disable prefix and postfix font size when gauge mode is enabled

* Use function to hide prefix/postfix size when using gauge

* Rename disableFontSizes to canChangeFontSizes

docs: Add haproxy example for running behind reverse-proxy

ref #9967

* cloudwatch: fix ebs_volume_ids by create a client-session before call ec2:DescribeInstances.

* cloudwatch: add support for multi instanceIds on call ebs_volume_ids.

tech: adds/removes in vendor folder according to dep 0.4.0.

mysql: pin the mysql dependency