libvirt: Add virsh dompmsuspend command test

New testcase:virsh_dompmsuspend.py/cfg
dompmsuspend(name, target, duration=0, **dargs)
dompmwakeup(name, **dargs)
svirt: update run_xxx() to run() in svirt_install.
Merge pull request #1242 from Guannan-Ren/master

libvirt: Add virsh dompmsuspend command test