Bug 1033563, Part 1: Move revocation checking code from mozilla::pkix::BuildForward to BuildForwardInner, r=keeler

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extra : rebase_source : 0f11eb64ffb00d953c39d81f4877067bd173eadd
Bug 1033563, Part 2: Convert mozilla::pkix::BuildForwardInner into an iterator-type thing, r=keeler

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extra : rebase_source : 175e308191441035db4f3eed4a855205bab1a3f3
Bug 1033563, Part 3: Change mozilla::pkix::TrustDomain::FindPotentialIssuers API to be iterator-like, r=keeler

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extra : rebase_source : e8c734ecb2de2c52dd8909c8b48f4bdb09d0128e