dashboards: Fix issue with first click when expanding folder in search

Fixes #10580

Add support for internal image store

(prometheus) show label name in paren after by/without/on/ignoring/group_left/group_right

Disable instead of hide mode options when line/points is unchecked

Add lumens unit

Recommend a limit on database query for influxdb annotations

Migrated from govendor to dep

* check upn field if email address isn't present, support for adfs

* correctly set login to the user's email address if not specified by the oauth server

* break up GenericOAuth.UserInfo into helper functions

Users not putting a limit on can end up causing bad performance. A recommended limit in the placehold is a quick little help.

Adjusted the border color on the buttons in dashboard nav, fixed alert email text area width, fixed padding-top issue on dashboard settings aside

The custom code in vendor is not needed anymore and most of the
mapping code can be replaced.

The latest master implements the ColumnType interface.

See https://github.com/go-sql-driver/mysql/issues/495

This removes the custom code in the vendor folder that
did a ColumnType mapping.

Make file_reader follow symlinks

Dashboard provisioning. Replace folder property with path

* plugin_lib:
  moves datasource plugin model to grafana/grafana_plugin_model

fixed duplicate dev dependency, closes #10542

corrected build instructions, #10532

Simplified build instructions i