Fixes #6448 - CH create w/o type and doc BZ1114065

fixes 2 issues:
1) fails to create system without type being set
2) correct documenation around the type parameter that
asks the user to use the value 'content host' as the type
Merge pull request #4369 from dustint-rh/create_CH_with_type

Fixes #6448 - cr/update CH with type CH BZ1114065