Resource group comes with a view gp_toolkit.gp_resgroup_status to get
the running status of all the resource groups.  The cpu and memory
usages as displayed in json format, they are hard to parse and
understand by human.  To make it more user friendly we now provide two
new views on the status, the cpu and memory usages are flatten into
multiple columns.  They also group the status by segment or host so it
is easier to find out the usages at different levels.
Reviewed-by: NZhenghua Lyu <zlv@pivotal.io>