Harden sd-viewer configuration and provision mailcap default rules; bump version#661

Merged

conorsch merged 4 commits intomainfrom config-hardening

Mar 10, 2021

+79-19

Commits on Mar 10, 2021

Prevent sd-viewer VMs from launching dispVMs
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Provision default mailcap rules and update tests
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Adds migration flag for mailcap-hardening

Conor Schaefer
authored and
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Bump version to 0.5.3; update changelog
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