MFC: Don't restore MNT_QUOTA bit in mnt_flag after a failed mount with      MNT_UPDATE flag, closing a race between nmount() and quotactl().
MFC: Don't restore MNT_QUOTA bit in mnt_flag after a failed mount with
     MNT_UPDATE flag, closing a race between nmount() and quotactl().

Approved by:	re (kensmith)

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