[Libvirt-cim] [PATCH 0 of 3] Memory devices from XML and raw XML parsing

This patch set: - Moves memory device parsing to use XML like the rest - Restructures the entry points of device-only parsing to share more code - Adds a function to parse plain XML into a dominfo structure for times where we don't have a virDomainPtr - Updates the xml_parse_test program to allow testing of the aforementioned function, as well as clean up the option parsing to make way for more features later