Add keyserver-options parser and expose ca-cert-file for recv-keys#166

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dmwilcox wants to merge 5 commits intoisislovecruft:masterfrom

dmwilcox:master

Commits on Oct 15, 2016

Initial commit to add keyserver options.
Daniel Wilcox
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Commits on Oct 17, 2016

Added validation for keyserver-options.
Daniel Wilcox
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Commits on Nov 29, 2017

Fix silly function naming error.
Daniel Wilcox
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Commits on Oct 23, 2018

Update per PR comments for pytest fix + using internal util.
Daniel Wilcox
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Merge branch 'master' of github.com:isislovecruft/python-gnupg
Daniel Wilcox
committed