Active resize validation around PPT ratio is broken for None values

[Matt Rabe]

The existing logic in utils/validation.py is:

        if self.ppt_ratio != curr_mem_cfg.ppt_ratio:
            msg = ("The virtual machine must be powered off before changing "
                   "the physical page table ratio. Power off virtual "
                   "machine %s and try again.") % self.cur_lpar_w.name
            raise ValidatorException(msg)

But the LPARBuilder won't put the PPT ratio element into the wrapper if the value is None. At the platform this is fine and the PPT ratio will remain the same value on resize. The validator should not throw this exception if the value is None.

[Matt Rabe (mdrabe)]

https://github.com/powervm/pypowervm/commit/9d1f90450b2017d41bf480f424a5af890d09a642