Label on chart tooltip changed
Label on chart tooltip changed

Old tooltip format {label}: {value}, {percentage}% confuses
when you see, for instance: kvm: 441, 84%. This can be
recognized as 441,84%

Change-Id: I4ccffc2d08a4d35fa2fc257da014403ff1f09480
Closes-Bug: #1507929

stackforge/fuel-stats,stackforge/fuel-stats,stackforge/fuel-stats