Add tests for Watch/WatchAll when deletion happens at root-level

[robshakir]

Looks like TestWatch/nonleaf_delete_at_container_level doesn't pass right now.

[wenovus]

Looks like TestWatch/nonleaf_delete_at_container_level doesn't pass right now.

Yep once ygot is imported this will pass.

[github-actions[bot]]

Pull Request Test Coverage Report for Build 5732348048

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 81.941%

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Totals
Change from base Build 5729821037:	0.0%
Covered Lines:	1883
Relevant Lines:	2298

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💛 - Coveralls