Add sudo support to copy, mcopy, delete and wait

[umputun]

This pr related to #62 and discussion #60

It adds support of sudo:true options for all copy (single/multi and mcopy) and to delete (both single file and recursive) as well as to wait command

The only command left without sudo support is sync and i don't have a good idea how this one can be done

[coveralls]

Pull Request Test Coverage Report for Build 4917830254

• 141 of 167 (84.43%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 83.945%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/runner/runner.go	134	160	83.75%

Totals
Change from base Build 4909746994:	0.2%
Covered Lines:	1762
Relevant Lines:	2099

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💛 - Coveralls