[Libvirt-cim] [PATCH 0 of 4] #3 - RPCS and RPCC ignores supported hypervisor type and wrong object path, adopt changes to HS

This patch set is now the combination of the one patch against RPCS and the two patches against RPCC, I sent out on friday. The reason to combine these three patches in one patch set is, that both provider - RPCS and RPCC - look very similar now. This brought me to the idea, that it is possible to also define a common interface for instances providers - as this is already done for associations -, where the common functions could do a main part of the error handling (which is currently done again and again in each single provider itself). In addition patch 4 updates HS (thanks to Kaitlin) with the new interface of RPCS. diff to patch set 2: - renamed parameter getInstance to is_get_inst for style conformance