unitest: mi test: suppress uninteresting mock function call

Wrap NVMeMiMock into NiceMock<> to suppress warning for uninteresting
call.

https://google.github.io/googletest/gmock_cook_book.html#NiceStrictNaggy

Tested: no warning in the unitest
Signed-off-by: Hao Jiang <jianghao@google.com>
Change-Id: I7dba915bbc8b93a0674db86275576d99c05646b1

tests/test_nvme_mi.cpp

diff --git a/tests/test_nvme_mi.cpp b/tests/test_nvme_mi.cpp
index daaa801..08b8e8b 100644
--- a/tests/test_nvme_mi.cpp
+++ b/tests/test_nvme_mi.cpp
@@ -193,7 +193,8 @@
   protected:
     NVMeTest() :
         object_server(systemBus),
-        nvme_intf(NVMeIntf::create<NVMeMiMock>(io, subsysPollTime / 10)),
+        nvme_intf(NVMeIntf::create<::testing::NiceMock<NVMeMiMock>>(
+            io, subsysPollTime / 10)),
         mock(*std::dynamic_pointer_cast<NVMeMiMock>(
             std::get<std::shared_ptr<NVMeMiIntf>>(nvme_intf.getInferface()))),
         subsys(std::make_shared<NVMeSubsystem>(io, object_server, systemBus,