[Libvirt-cim] [PATCH 0 of 3] #2 - Check client given object pathes in ElementCapabilities provider

[Heidi Eckhart]

To enable the check for the client's given object path in ElementCapabilities, changes to the ComputerSystem and AllocationCapabilities provider have been necessary.

Diff to patch #1:
- added a new function to libcmpiutil - cu_validate_ref(ref, inst) - that does the check between the system instance and the client given instance
- get_domain() is now using the new libcmpiutil function
- the parameter CMPIInstance **inst is now used to "configure" get_domain(); for internal usage the inst is returned and for external usage this can be ignored by setting it to NULL
- validate_domain_ref() is now only an interface name for the client

- removed patch unrelated changes in patch 2
- reworked logic to return instance(s)