fix multiple node half rotation MPI error

[jiangtong1000]

Fix the MPI error when running with multiple nodes and performing half_rotate, which involves the following code. scomm needs to be passed into this code.

ipie/ipie/utils/mpi.py

Line 117 in 4b60ce0

win = MPI.Win.Allocate_shared(nbytes, itemsize, comm=comm)

Otherwise leads to

win = MPI.Win.Allocate_shared(nbytes, itemsize, comm=comm)
File "mpi4py/MPI/Win.pyx", line 116, in mpi4py.MPI.Win.Allocate_shared
mpi4py.MPI.Exception: MPI_ERR_RMA_SHARED: Memory cannot be shared

@Jinghong-Zhang also met this before.

[jiangtong1000]

pylint reported error on unmodified files. I guess github CI updated its pylint.

[linusjoonho]

LGTM