Bug 877376: Add tests for intermediate CA basic constraints and KU/EKU, r=briansmith

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extra : rebase_source : b831ab0e459af4ea0f43a1184e32b333f43b2f01
Bug 971178, Part 1: Expand test_cert_signatures.js test insanity::pkix, r=cviecco

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extra : rebase_source : 90cf68bdb50b8499aeda3e14c476977db9e43c2a
Bug 971178, Part 2: Make test_getchains.js test insanity::pkix, r=cviecco

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extra : rebase_source : ff9620bad6b20a84cf179af7ffa7a74f6ffd6640
Bug 971178, Part 3: Expand test_certificate_usages.js test insanity::pkix, r=cviecco

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extra : rebase_source : 3810925d18767d1b04f8a47004a0ab7a631e5b4b
Bug 971178, Part 4: Expand test_intermediates_basic_constraints.js test insanity::pkix, r=cviecco

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extra : rebase_source : b419a3087b3d327c9a48d984551abeac4943be7a