[Outreachy] advice: revamp advise API#548

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HebaWaly wants to merge 4 commits intogitgitgadget:masterfrom

HebaWaly:advice_refactoring

Commits on Feb 24, 2020

advice: extract vadvise() from advise()
HebaWaly
committed

Commits on Feb 27, 2020

advice: change "setupStreamFailure" to "setUpstreamFailure"
HebaWaly
committed

Commits on Mar 2, 2020