[Libvirt-cim] [PATCH 0 of 3] Add automated base schema installation

This set adds support for automated base schema installation. This will be handy for users of the source tree, as well as required for proper installation via RPM. I have only tested with Pegasus, so sfcb testing would be appreciated. The first patch adds the schema patch and interop mof. The second adds the installation script. The third makes the required changes to the build system to fetch the CIM schema zip during build. Testing can be easily accomplished by running "make preinstall" after building. Testing of the whole process as part of the RPM install would be good too. For Pegasus, remove the entire /var/lib/Pegasus/repository/root#virt directory before testing. For SFCB, removing /usr/local/share/sfcb/CIM/* should be sufficient. After preinstall, make sure postinstall works and that the providers load and work. /