Respect NO_FSCHG and don't set 'schg' flag on passwd/yppasswd is defined.
Respect NO_FSCHG and don't set 'schg' flag on passwd/yppasswd is defined.

MFC after:	2 weeks

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase