[et-mgmt-tools] [PATCH 2/6] Add a few helper util functions

[Cole Robinson]

This patch adds a few functions to virtinst.util:

1. is_storage_capable: receives an active connection
   and attempts to determine if it supports storage
   management. This is used in a few places to maintain
   existing behavior and error paths for connections
   to older libvirt versions.

2. is_remote: receives a uri and determines if it
   specifies a remote connection. Used for various
   validation checks.

3. get_xml_path: Receives an xml blob and an
   xPath, and returns that path from the xml. This
   is largely a convenience function since we have
   this code duplicated in about 10 places throughout
   virtinst and virt-manager.

Thanks,
Cole

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