[!296] [test] Run more MPI tests in parallel

Merge branch 'feature/run-more-mpitests-in-parallel' into 'master'

See merge request [!296]

  [!296]: Nonecore/dune-istl/merge_requests/296

dune/istl/test/CMakeLists.txt

@@ -93,12 +93,16 @@ dune_add_test(SOURCES cholmodtest.cc)
 
 # MPI tests
 dune_add_test(SOURCES matrixredisttest.cc
+              MPI_RANKS 1 2 4
+              TIMEOUT 600
               CMAKE_GUARD MPI_FOUND)
 
 dune_add_test(SOURCES vectorcommtest.cc
+              MPI_RANKS 1 2 4
+              TIMEOUT 600
               CMAKE_GUARD MPI_FOUND)
 
-  dune_add_test(SOURCES matrixmarkettest.cc)
+dune_add_test(SOURCES matrixmarkettest.cc)
 
 dune_add_test(SOURCES iluildltest.cc)