Delete the test_preparing_xml_info libvirt test
Delete the test_preparing_xml_info libvirt test

The test_preparing_xml_info test case is about to be intentionally
broken by refactoring in following patches. It will be replaced
by a new test at the end

blueprint libvirt-xml-config-apis
Change-Id: I2c5f19a071983e581ed5ed3bc8a84e14fbb6897b
Signed-off-by: Daniel P. Berrange <bb938cf255e055ff3507f2627d214e8e62118fcf@redhat.com>

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