Bug 707275, Part 1: Add telemetry for TLS intolerance, r=keeler

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extra : rebase_source : 8331f1486ad764838812ea500742a97fbc025858
Bug 707275, Part 2: Add telemetry for cipher suites and key sizes, r=keeler

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extra : rebase_source : bd5f91877de357b415b6f143eccc87434d72db2b
Bug 937984: Allow client.py to pull NSPR and NSS from a user-specified repo, r=kaie

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extra : rebase_source : 86b2cf24d3f425eab893e2cb0096e2439f30b357
Bug 898431: Update to NSS 3.15.4 beta 3 (NSS_3_15_4_BETA3), r=me

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extra : rebase_source : a6dd976f23ebdd33dcf6fd26e4752ddb2bbc5363
Bug 901718: Remove TLS intolerance fallback from TLS 1.0 to SSL 3.0 for connection resets, r=honzab

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extra : rebase_source : 304e73126b66ae2e1a9fa6ae4c0cc3fa803aaac0
Bug 934663 followup: fix unused variable warning, r=me

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extra : rebase_source : e343b569df4d313f0f5f65fc82de99b9ea5b2ba9
Bug 901718, Part 2: fix comment, r=me