Implement supervisor switchover functionality (#578)

* Initial commit for supervisor switchover implementation

* Cleanup test file and setup fresh environment for each test

* Implement supervisor switchover with async background processing

fix delete for hostif (#539)

Merge pull request #517 from openconfig/gribi-embed

Update gRIBI server to accommodate gRPC changes.

Update operator image (#489)

Support log action and filter IPs (#465)

Deinternalize kernel package (#437)

fix operator again (#382)

* fix op

* manager

Implement gNOI time (#173)

Merge pull request #172 from openconfig/more-validation-tests

Add a few more gNMI validation tests

Fix certificate handling and add args to operator (#163)

* Fix certificate handling and add  args to operator

* mod fixes

* fix

* sort args

* fix