* add FindGMock.cmake which allows user to use the libgtest-dev
shipped by distro
* add GMock::{GMock,Main}, GTest::{GTest,Main} targets to be
compatible with FindGTest.cmake and FindGMock.cmake, which
expose the built libraries with properties adhered to
them. so the consumer of them can import them in a better way.
* update tests to drop the commands like
set_target_properties(foo PROPERTIES COMPILE_FLAGS ${UNITTEST_CXX_FLAGS}),
as they are already linked against gmock and gtest.
Signed-off-by: Kefu Chai <kchai@redhat.com>
