Move key-loading and crosscert-checking out of feature/relay

This is also used by onion services, so it needs to go in another
module.

src/test/fuzz/fuzz_descriptor.c

@@ -4,7 +4,8 @@
 #include "core/or/or.h"
 #include "feature/nodelist/routerparse.h"
 #include "feature/nodelist/routerlist.h"
-#include "feature/relay/routerkeys.h"
+#include "feature/nodelist/torcert.h"
+#include "feature/keymgt/loadkey.h"
 #include "test/fuzz/fuzzing.h"
 
 static int
@@ -76,4 +77,3 @@ fuzz_main(const uint8_t *data, size_t sz)
   }
   return 0;
 }
-

src/test/test_routerkeys.c

@@ -11,6 +11,7 @@
 #include "feature/relay/routerkeys.h"
 #include "lib/crypt_ops/crypto_cipher.h"
 #include "lib/crypt_ops/crypto_format.h"
+#include "feature/keymgt/loadkey.h"
 #include "feature/nodelist/torcert.h"
 #include "test/test.h"