Change in vdsm[master]: virt: devices: extract common parsing function

[Code Review]

From Dan Kenigsberg :

Dan Kenigsberg has submitted this change and it was merged.

Change subject: virt: devices: extract common parsing function
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virt: devices: extract common parsing function

We want all the devices to be able to initialize themselves
from their XML representation.
We start isolating the code which update the state from the XML,
extracting one helper function that we will use in both paths.

Change-Id: I474f93e1b2e64c8212e2e087c864e3f49403b80f
Signed-off-by: Francesco Romani 
---
M lib/vdsm/virt/vmdevices/core.py
M tests/virttests/devicexml_test.py
2 files changed, 72 insertions(+), 29 deletions(-)

Approvals:
  Jenkins CI: Passed CI tests
  Dan Kenigsberg: Looks good to me, approved
  Francesco Romani: Verified
  Milan Zamazal: Looks good to me, but someone else must approve