This commit adds support for TLS client authentication in the CLI.
It adds the necessary fields to the config and CLI parameters, modeled
on the existing server-crt functionality.
It also fixes 2 bugs in the grpcproxy:
1. The grpcproxy would ignore the server-crt when making a call to the
upstream server.
2. The grpcproxy would falsely assume that the HTTP status code returned
by the upstream server is always 200. It would then try to parse the
body as if it was a grpc response. At best this led to weird errors
being shown, at worst I have seen it cause the runtime to run out of
memory.
* Move utils packages that are required for gitops engine under engine/pkg/utils package.
Following changes were implemented:
* util/health package is split into two parts: resource health assessement & resource health assessement and moved into engine/pkg/utils
* utils packages moved: Closer and Close method of util package moved into engine/pkg/utils/io package
* packages diff, errors, exec, json, kube and tracing moved into engine/pkg/utils
* Move single cluster caching into engine/kube/cache package
* move sync functionality to engine/kube/sync package
* remove dependency on metrics package from engine/pkg/utils/kube/cache
* move annotation label definitions into engine/pkg/utils/kube/sync
* make sure engine/pkg has no dependencies on other argo-cd packages
* allow importing engine as a go module
* implement a high-level interface that might be consumed by flux
* fix deadlock caused by cluster cache event handler
* ClusterCache should return error if requested group kind not found
* remove obsolete tests
* apply reviewer notes
* Set root path
* updated http mux if --rootpath is set during server startup.
updated baseHRef if --rootpath is set.
added --grpc-web-root-path for CLI.
* added rootpath as part of config context name
* clean up not used variables.
