Added applies_to_method to parent Host & Cluster charts.

Added applies_to_method to chart for Parent Host and Cluster charts so charts side-by-side comparison charts match up. Also added CPU (%) chart to parent Host and Cluster yaml, this chart was added previously to VmOrTemplate yaml.

https://bugzilla.redhat.com/show_bug.cgi?id=1138449
Merge pull request #766 from h-kataria/C&U_chart_comparison_fix

Added applies_to_method to parent Host & Cluster charts.