enable wall friction and heat transfer closure models in HeatExchanger component, add one new heat transfer test case for sodium to sodium heat exchanger
enable wall friction and heat transfer closure models in HeatExchanger component, add one new heat transfer test case for sodium to sodium heat exchanger

r12843

bwspenc/moose,andrsd/moose,harterj/moose,andrsd/moose,jessecarterMOOSE/moose,lindsayad/moose,bwspenc/moose,dschwen/moose,dschwen/moose,laagesen/moose,andrsd/moose,sapitts/moose,idaholab/moose,bwspenc/moose,laagesen/moose,jessecarterMOOSE/moose,lindsayad/moose,idaholab/moose,jessecarterMOOSE/moose,dschwen/moose,jessecarterMOOSE/moose,sapitts/moose,bwspenc/moose,lindsayad/moose,harterj/moose,harterj/moose,milljm/moose,andrsd/moose,lindsayad/moose,dschwen/moose,andrsd/moose,laagesen/moose,dschwen/moose,laagesen/moose,idaholab/moose,milljm/moose,harterj/moose,milljm/moose,harterj/moose,sapitts/moose,sapitts/moose,idaholab/moose,laagesen/moose,bwspenc/moose,sapitts/moose,milljm/moose,jessecarterMOOSE/moose,idaholab/moose,lindsayad/moose,milljm/moose