evaluate norm only for rank 0 in tests #1438

Job	Run time
build-on-cuda (OPENMP=ON)	8m 38s
build-and-test (MPI=ON, OPENMP=ON, SMM=blas, openmpi)	4m 6s
build-and-test (MPI=ON, OPENMP=ON, SMM=blas, mpich)	3m 52s
build-and-test (MPI=ON, OPENMP=ON, SMM=libxsmm, openmpi)	3m 58s
build-on-opencl (OPENMP=ON, SMM=libxsmm)	7m 46s
build-on-rocm (OPENMP=ON)	8m 36s
build-and-test (MPI=ON, OPENMP=ON, SMM=libxsmm, mpich)	4m 27s
pre-commit	1m 5s
build-and-test (MPI=ON, OPENMP=OFF, SMM=blas, openmpi)	8m 59s
build-and-test (MPI=ON, OPENMP=OFF, SMM=blas, mpich)	9m 34s
build-and-test (MPI=ON, OPENMP=OFF, SMM=libxsmm, openmpi)	8m 55s
build-and-test (MPI=ON, OPENMP=OFF, SMM=libxsmm, mpich)	9m 13s
build-and-test (MPI=OFF, OPENMP=ON, SMM=blas, openmpi)	5m 31s
build-and-test (MPI=OFF, OPENMP=ON, SMM=libxsmm, openmpi)	5m 18s
build-and-test (MPI=OFF, OPENMP=OFF, SMM=blas, openmpi)	3m 38s
build-and-test (MPI=OFF, OPENMP=OFF, SMM=libxsmm, openmpi)	3m 12s
Combine & check coverage.	1m 41s
	1h 38m 29s

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