CIMI Systems: fix for DTACLOUD-559 - id was not set for SystemMachineCol...

This should fix the issue reported in [JIRA DTACLOUD-559](https://issues.apache.org/jira/browse/DTACLOUD-559)

with this applied the tests recently pushed from [pull request 28](https://github.com/deltacloud/deltacloud-core/pull/28) run clean for me

thanks, marios