ocicrypt: keyprovider: fix warnings on dead code

For quite some time, we have seen:

warning: struct `TestRunner` is never constructed
Warning:    --> ocicrypt-rs/src/keywrap/keyprovider/mod.rs:558:16
    |
558 |     pub struct TestRunner {}
    |                ^^^^^^^^^^
    |
    = note: `TestRunner` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
    = note: `#[warn(dead_code)]` on by default

warning: struct `TestServer` is never constructed
Warning:    --> ocicrypt-rs/src/keywrap/keyprovider/mod.rs:570:12
    |
570 |     struct TestServer {}
    |            ^^^^^^^^^^
    |
    = note: `TestServer` has a derived impl for the trait `Default`, but this is intentionally ignored during dead code analysis

The fix is to add them behind the right feature flags.

Signed-off-by: Mikko Ylinen <[email protected]>

ocicrypt-rs/src/keywrap/keyprovider/mod.rs

@@ -555,6 +555,7 @@ mod tests {
 
     ///Test runner which mocks binary executable for key wrapping and unwrapping
     #[derive(Clone, Copy)]
+    #[cfg(feature = "keywrap-keyprovider-cmd")]
     pub struct TestRunner {}
 
     ///Mock annotation packet, which goes into container image manifest
@@ -567,6 +568,10 @@ mod tests {
 
     ///grpc server with mock api implementation for serving the clients with mock WrapKey and Unwrapkey grpc method implementations
     #[derive(Default)]
+    #[cfg(any(
+        feature = "keywrap-keyprovider-grpc",
+        feature = "keywrap-keyprovider-ttrpc"
+    ))]
     struct TestServer {}
 
     #[cfg(any(