Adds support for a "generic input" extension point that allows specifying inputs that are not dependent on protocol data.
Adds an environment variable generic input that allows matching on the value of an environment variable.
Signed-off-by: Snow Pettersen <snowp@lyft.com>
Mirrored from https://github.com/envoyproxy/envoy @ 758a9a90c15331fbfd093f23170454c5a2fbf903
data-plane-api(Azure Pipelines)