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Allow unit overwrite if cloudwatch/stackdriver datasource response doesn't include unit

Escape values in metric segment and sql part

stackdriver: make sure unit is not returned to the panel if mapping from stackdriver unit to grafana unit can't be made

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fix LDAP Grafana admin logic

This reverts commit 9dd33b79e037fc75ddc5f3a6b294edba99e99b94.

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fix concurrent map writes

Explore: fix render issues in split view

Explore: Use react-table as table component

Co-authored-by: Adrien Fillon <adrien.fillon@cdiscount.com>
Co-authored-by: Remi Buisson <remi.buisson@cdiscount.com>

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 Add socket support for mysql data source

- avoid line wrap in row tools (add/remove/clear)
- avoid text overflow in query field

Fix typeahead behaviour for QueryField

Support Data source permissions

Related: #13484

These changes were originally intended to address a bug whereby a
suggestion for an already selected label value continues to appear.
However, they also appear to fix several other problems in the area:

- Wrong suggestions when using negated label matching operators
- Misaligned label value suggestion replacements

Related: #13484

- adds react-table as dependency
- replaces custom table component in Explore
- vendors react-table styles and overrides them (currently in
  explore.scss)

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