CIMI: add system and templates to client UI
CIMI: made id optional in client UI helper method
so it can be used for collection operations such as import
FGCP: add descriptions to machine templates in system template
CIMI: added memory unit (KiB) and use consistent naming
between machine and machine_configuration
CIMI: add dealing with 202 return code from system delete
Used by FGCP. See 4.2.1.7 Asynchronous operations of CIMI 1.0.1 spec.