Gordon Brown 88b9810567
Remove obsolete deprecation checks (#37510)
* Remove obsolete deprecation checks

This also updates the old-indices check to be appropriate for the 7.x
series of releases, and leaves it as the only deprecation check in
place.

* Add toString to DeprecationIssue

* Bring filterChecks across from 6.x

* License headers
2019-01-18 14:24:34 -07:00
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