Multiple expanders can now be specified, expanders now "filter to the
tied for best" instead of "selecting the best" so the output of one
expander is now fed to the input of the next. Each expander may only
be used once to disallow bad configuration. This should not be a change
in functionality as in the event of a tie the random expander is still
used.
The following things changed in scheduler and needed to be fixed:
* NodeInfo was moved to schedulerframework
* Some fields on NodeInfo are now exposed directly instead of via getters
* NodeInfo.Pods is now a list of *schedulerframework.PodInfo, not *apiv1.Pod
* SharedLister and NodeInfoLister were moved to schedulerframework
* PodLister was removed
Ryan McNamara
Bartłomiej Wróblewski
Jakub Tużnik
Pengfei Ni
lsytj0413
Marcin Wielgus
thebigjc