* [#466]Added XML modifier method

* [466]Enable qemu agent on new KVM machines

* [466]Added set_time method on resume kvm machine

* [466]Added set_time method on resume kvm machine

* [466]fixed bug creating xml for new machines

* [466]fixed bug creating xml for new machines

* [466]Only executed when resume kvm

* [466]change the function call from post_resume to post_start

* [466]update

* [466]clean debug

* Tests passed!