Fixes #13424 - c3 patternfly react implementation

fixes #15919 - statistics page is loaded via AJAX

Also:
- refactor how statistics data is being called, now it should be trivial
to add additional charts or consume other data from it. It should make
it much easier to reuse statistics charts in other places...

Revert "Fixes #13424 - Add Patternfly Donut Chart React component"

This reverts commit f4b2a11615d14ba1407aecd55523cd44d1010e14.

Fixes #13424 - Add Patternfly Donut Chart React component

Our donut charts do not look like they should in Patternfly.
https://www.patternfly.org/patterns/donut-chart/ uses c3, so we can do
that too.
Eventually I want to remove flot_pies too, but I have to yet figure out...

Fixes #4629 - Migrate UI to Patternfly

Fixes #5810 - fixes issue with incorrect page titles

fixes #2741 - remove dash from -%> to %>

flot charts

Use flot charts instead of highcharts.
flot charts license is more friendly.

This version of the code is feature compatible with the old charts,
including:
pie: drill-down and expend.
stacked charts: zoom, hide series in legend.
all types has tooltips....

fix minor css classes declaration.

updates UI to bootstrap v2