caucase.ca: Add Authority Key Identifier extension in produced CRLs.

This extension is required by rfc5280 (see section 5.2.1) but was
overlooked.
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passed SlapOS.Eggs.UnitTest-Master.Python2

00:31:54

passed SlapOS.Eggs.UnitTest-Master.Python3

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passed SlapOS.Eggs.UnitTest-Master.Python2

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failed SlapOS.Eggs.UnitTest-Master.Python3

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