Automated checkin: version bump for thunderbird 17.0.8esr release. DONTBUILD CLOSED TREE a=release

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branch : GECKO1708esr_2013080114_RELBRANCH
Added THUNDERBIRD_17_0_8esr_RELEASE THUNDERBIRD_17_0_8esr_BUILD1 tag(s) for changeset 56f3d584295b. DONTBUILD CLOSED TREE a=release

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branch : GECKO1708esr_2013080114_RELBRANCH