Tests to not depend on psmisc to be installed
Tests to not depend on psmisc to be installed

This patch is mocking the methods that uses "fuser" after writing the
partition table, since this is a unittest and the partition table is
written to a temporary file we don't need fuser to be checking whether
other process are accessing that file descriptor or not.

Closes-Bug: #1550438
Change-Id: I2a12d4fc2e7df4eb24a977ee6b1ff5b3ad479755

NaohiroTamura/ironic-lib,openstack/ironic-lib