Re-evaluate usage of addSuppressed

[lewisd32]

discussed offline with @NiteshKant ... I think we should re-evaluate our usage of addSuppressed. In the face of static exceptions and addSuppressed may throw if the exception is the same instance this creates potentially undesirable behavior at the benefit of "maybe providing more context".

Originally raised here: https://github.com/servicetalk/servicetalk/pull/131#discussion_r232133741

[Scottmitch]

I think this applies more generally than just CommanderUtils. Let me update the title