[et-mgmt-tools] [PATCH] catch and report errors during hardware manipulation

[Cole Robinson]

The attached patch adds a lot of error catching and reporting for adding
hardware in virt-manager. The particulars are:

1) Build virtinst VirtualDisk and VirtualNics as we go through creation
wizards to reuse present validation.

2) Added a few cases of using the "install_error" infrastructure if we
fail when at the end of the wizard.

3) Added error checking for removing hardware in the 'details' screen.

4) A small cleanup in create.py

This stuff will definitely be useful for future bug reports :)

- Cole

-- 
Cole Robinson
crobinso at redhat.com
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