add paddle_test_util static lib to simplify unit test. #1058
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This PR is to simplify unit test by adding paddle_test_util static lib.
For example, in add paddle functions for Matrix ContextProjection APIs #1009,
add_unittest(ContextProjectionOpTest
ContextProjectionOpTest.cpp
../gserver/tests/TestUtil.cpp)
could be simplified as add_simple_unittest(ContextProjectionOpTest).
In gserver/tests/CMakeLists.txt, we could remove the dependency of TestUtil.cpp in many unit tests.