cmake: only allow up to 1 hour for a ceph test

quote from
https://cmake.org/cmake/help/v3.0/prop_test/TIMEOUT.html?highlight=timeout

> If it exceeds that the test process will be killed and ctest will move
> to the next test.

this helps us to identify test hang.

Signed-off-by: Kefu Chai <kchai@redhat.com>

cmake/modules/AddCephTest.cmake

@@ -15,6 +15,10 @@ function(add_ceph_test test_name test_path)
     PATH=${CMAKE_RUNTIME_OUTPUT_DIRECTORY}:${CMAKE_SOURCE_DIR}/src:$ENV{PATH}
     PYTHONPATH=${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/cython_modules/lib.linux-x86_64-2.7:${CMAKE_SOURCE_DIR}/src/pybind
     CEPH_BUILD_VIRTUALENV=${CEPH_BUILD_VIRTUALENV})
+  # none of the tests should take more than 1 hour to complete
+  set_property(TEST
+    ${test_name}
+    PROPERTY TIMEOUT 3600)
 endfunction()
 
 #sets uniform compiler flags and link libraries