Re: [Libvir] RFC: PATCH 5/5: async job for test driver save API

This patch implements the virDomainSaveJob method for the test driver as a proof of concept. First of all it adds a inJob flag to the testDom and testNet objects. This is to make sure that operations which may change an objects run state are rejected, if a background job is active. Then it merely implements the virDomainSaveJob method as per the previous description. Actually it doesn't really do any save operation, this impl just illustrates the way progress updates propagate back to the caller, and the use of cancellation.