add a member function getLength() for the PipeBase component
add a member function getLength() for the PipeBase component

r14723

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