Add reference on kernel in blocked scenarios.

- Prevents kernel destruction while it may still be in use.

Change-Id: I1f87d09c5cabf29644a1b06b63f1789dbb15985a

unit_tests/mocks/mock_kernel.h

@@ -212,8 +212,8 @@ class MockKernelWithInternals {
         mockKernel->setSshLocal(&sshLocal, sizeof(sshLocal));
     }
     ~MockKernelWithInternals() {
-        delete mockKernel;
-        delete mockProgram;
+        mockKernel->decRefInternal();
+        mockProgram->decRefInternal();
     }
 
     operator MockKernel *() {