Changed target mpich -> openmpi in Dockerfile.

6 jobs for issue50_mpi-integration in 340 minutes and 40 seconds (queued for 4 seconds)
Status Name Job ID Coverage
  Build
passed prepare #1821367
docker

01:43:51

failed prepare #1820472
docker

00:56:48

 
  Test
passed lint #1820476
docker

00:01:58

passed test-prerequisites #1820473
docker

00:03:25

passed unittest-gurobi #1820474
docker

00:07:05

canceled unittest-scip #1820475
docker

03:56:48