Add diag_manager testing for openmp #2260

Job	Run time
build (--disable-openmp, --with-yaml, --enable-deprecated-io)	6m 37s
build (--disable-openmp, --with-yaml, --disable-deprecated-io)	6m 38s
build (--disable-openmp, --enable-test-input=/home/unit_tests_input, --enable-deprecated-io)	6m 38s
build (--disable-openmp, --enable-test-input=/home/unit_tests_input, --disable-deprecated-io)	6m 40s
build (--enable-mixed-mode, --with-yaml, --enable-deprecated-io)	5m 56s
build (--enable-mixed-mode, --with-yaml, --disable-deprecated-io)	6m 9s
build (--enable-mixed-mode, --enable-test-input=/home/unit_tests_input, --enable-deprecated-io)	6m 30s
build (--enable-mixed-mode, --enable-test-input=/home/unit_tests_input, --disable-deprecated-io)	6m 31s
build (--disable-setting-flags, --with-yaml, --enable-deprecated-io)	6m 34s
build (--disable-setting-flags, --with-yaml, --disable-deprecated-io)	6m 38s
build (--disable-setting-flags, --enable-test-input=/home/unit_tests_input, --enable-deprecated-io)	6m 39s
build (--disable-setting-flags, --enable-test-input=/home/unit_tests_input, --disable-deprecated-io)	6m 40s
build (--with-mpi=no, --with-yaml, --enable-deprecated-io)	4m 2s
build (--with-mpi=no, --with-yaml, --disable-deprecated-io)	4m 8s
build (--with-mpi=no, --enable-test-input=/home/unit_tests_input, --enable-deprecated-io)	4m 30s
build (--with-mpi=no, --enable-test-input=/home/unit_tests_input, --disable-deprecated-io)	4m 51s
	1h 35m 41s

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