core: cluster emulation mode - add procedure to set emulatedMachine

Added a procedure to update only the emulated_machine value on a vds_group

Bug-Url: https://bugzilla.redhat.com/927874
Change-Id: I7bc4709713078bcd8184ee6d03396522b60c5068
Signed-off-by: Roy Golan <rgolan@redhat.com>
core: fix upgrade script version
Signed-off-by: Roy Golan <rgolan@redhat.com>

Change-Id: I11a33e70554721e8feb8922f24b2455620b6f1d7
Signed-off-by: Roy Golan <rgolan@redhat.com>