[et-mgmt-tools] [PATCH] Fix virt-install iso path validation (BZ 249424)

[Cole Robinson]

This patch builds a VirtualDisk object using the cdrom path passed to
virt-install to reuse the already present validation. It also touches up
some of the error messages the VirtualDisk throws to make them more
general specific. This solves bz 249424.

- Cole

-- 
Cole Robinson
crobinso at redhat.com
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