virsh_managedsave: Fix configuration option

virsh_managedsave.status_error_yes.name_option.shut_status failed if it was
run as a part of the testsuite and the testing VM was running before. This
was due to misconfiguration of the environment, where the test was
expecting the machine to be off. Change the status command to kill the VM
before the test.
Merge pull request #702 from Antique/virsh-managedsave

Fix virsh managedsave