Switch tools to standalone cobra-cli dependency

[liggitt]

Switches to use the extracted cobra-cli command since it is being removed from the github.com/spf13/cobra module (xref spf13/cobra#1597)

The first commit updates tools to the current spf13/cobra and tidies, the second commit switches to the corresponding cobra-cli version

[coveralls]

Pull Request Test Coverage Report for Build 1925380704

• 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 92.478%

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Totals
Change from base Build 1729108780:	0.0%
Covered Lines:	209
Relevant Lines:	226

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💛 - Coveralls