Remove TLS hostname override

[sayan-biswas]

Changes

Removes the TLS hostname override option and disables TLS verification for the internal gRPC client used for proxying incoming request to gRPC server.

Fixes #521

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Release Notes

ACTION REQUIRED: Config option, TLS_HOSTNAME_OVERRIDE is removed as the internal gRPC proxy client doesn't need to reverify the TLS.

[khrm]

/lgtm

[adambkaplan]

This should have an ACTION REQUIRED prefix on the release note. This introduces a "breaking" change by removing a deployment configuration option.

[sayan-biswas]

This should have an ACTION REQUIRED prefix on the release note. This introduces a "breaking" change by removing a deployment configuration option.

Updated release note.

[enarha]

/approve

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