Nsmgr, nsmgr-proxy and proxy-dns don't use default registry client

[NikitaSkrynnik]

Question

Why don't registry-memory, nsmgr, nsmgr-proxy and proxy-dns use default registry client ?

Examples

Places where registry client should be used:

1. https://github.com/networkservicemesh/sdk/blob/main/pkg/networkservice/chains/nsmgr/server.go#L202
2. https://github.com/networkservicemesh/sdk/blob/main/pkg/networkservice/chains/nsmgr/server.go#L222
3. https://github.com/networkservicemesh/sdk/blob/main/pkg/networkservice/chains/nsmgrproxy/server.go#L201
4. https://github.com/networkservicemesh/sdk/blob/main/pkg/networkservice/chains/nsmgrproxy/server.go#L212
5. https://github.com/networkservicemesh/sdk/blob/main/pkg/networkservice/chains/nsmgrproxy/server.go#L247
6. https://github.com/networkservicemesh/sdk/blob/main/pkg/networkservice/chains/nsmgrproxy/server.go#L271
7. https://github.com/networkservicemesh/sdk/blob/main/pkg/registry/chains/memory/server.go#L127
8. https://github.com/networkservicemesh/sdk/blob/main/pkg/registry/chains/memory/server.go#L158
9. https://github.com/networkservicemesh/sdk/blob/main/pkg/registry/chains/proxydns/server.go#L40
10. https://github.com/networkservicemesh/sdk/blob/main/pkg/registry/chains/proxydns/server.go#L52