Add save-in to interface kernels (#9854)
Add save-in to interface kernels (#9854)

SudiptaBiswas/moose,nuclear-wizard/moose,milljm/moose,permcody/moose,nuclear-wizard/moose,friedmud/moose,harterj/moose,idaholab/moose,andrsd/moose,lindsayad/moose,yipenggao/moose,jessecarterMOOSE/moose,nuclear-wizard/moose,dschwen/moose,laagesen/moose,milljm/moose,milljm/moose,harterj/moose,bwspenc/moose,jessecarterMOOSE/moose,permcody/moose,laagesen/moose,lindsayad/moose,Chuban/moose,dschwen/moose,jessecarterMOOSE/moose,lindsayad/moose,yipenggao/moose,idaholab/moose,dschwen/moose,friedmud/moose,milljm/moose,idaholab/moose,yipenggao/moose,sapitts/moose,permcody/moose,sapitts/moose,YaqiWang/moose,sapitts/moose,laagesen/moose,harterj/moose,lindsayad/moose,nuclear-wizard/moose,laagesen/moose,bwspenc/moose,friedmud/moose,SudiptaBiswas/moose,YaqiWang/moose,idaholab/moose,yipenggao/moose,andrsd/moose,YaqiWang/moose,dschwen/moose,YaqiWang/moose,idaholab/moose,lindsayad/moose,Chuban/moose,Chuban/moose,friedmud/moose,sapitts/moose,andrsd/moose,sapitts/moose,bwspenc/moose,andrsd/moose,Chuban/moose,bwspenc/moose,jessecarterMOOSE/moose,andrsd/moose,dschwen/moose,harterj/moose,permcody/moose,SudiptaBiswas/moose,SudiptaBiswas/moose,laagesen/moose,SudiptaBiswas/moose,jessecarterMOOSE/moose,milljm/moose,bwspenc/moose,harterj/moose