Charting: add donut chart support.
Remove <Unknown> entry from Authentication Status box.

Remove <Unknown> entry from Authentication Status box, these entries were for keypairs(AuthKeyPairAmazon), and had null in authtype field in the table.

https://bugzilla.redhat.com/show_bug.cgi?id=1158180
https://bugzilla.redhat.com/show_bug.cgi?id=1158179
Charting: put donut before pie.
Charting: pie type legend for donuts.
Merge pull request #1218 from h-kataria/remove_unknown_credentials_from_cloud_summary

Remove <Unknown> entry from Authentication Status box.
Merge pull request #1164 from martinpovolny/donut_charts

Charting: add donut chart support.