reva feat: enable TLS for gRPC connections

Description

This PR allows user configuration for using TLS certificates instead of setting up a proxy to use Reva with secure endpoints. A user has three options:

Insecure Connection
Use with self-signed/local certificates
Use with Hashicorp Vault (can be augmented to include other services too)

Changes

Configuration

Now any user will have the option of setting insecure, skip_verify and other new security configuration values in the shared table. Example:

[shared]
insecure = true
# other configuration

The user can also set the same new configurations for the individual interceptors, services etc. This kind of configuration will have a greater precedence over the previous type of configuration. Example:

[grpc.services.authregistry]
insecure = true
# other configuration

Miscellaneous

Added a Makefile recipe to generate local certificates.

Related Links

#1962
#2216

Apr 28 '22 12:04 amalthundiyil

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would create a changelog item based on your changes.