[dts] [PATCH V1]framework/qemu_libvirt: fix xml format and pep8 issue

[yufengmx]

qemu_libvirt is only used by vm_power_manager currently. 
*. check vm xml file existence before remove it to fix warning of using except. 
*. format libvirt xml content with pretty style to make vm config file easier to set manually. 
old format config only one line in xml file. 
*. fix pep8 issue. 

yufengmx (1):
  framework\qemu_libvirt: fix xml format and pep8 issue

 framework/qemu_libvirt.py | 60 ++++++++++++++++++++++++++++-------------------
 1 file changed, 36 insertions(+), 24 deletions(-)

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1.9.3