Revive Envoy-OpenSSL development

[cfilleke]

envoy-openssl has been dormant for 2 years; this is to revive the project disciplines

• [x] create & configure github project
• [ ] label legacy issues & park them for review
• [ ] add issues & create kb cards from design doc
• [ ] invite team members to assign themselves
• [ ] associate first tranche of tasks to milestone 1

[candita]

@cfilleke are you still leading the revival?

[cfilleke]

Responding on RH email, thanks.