Let ftp command use only PORT(no EPRT) for IPv4 destination.   Because if ftpd is invoked with -R option, and EPRT is used via firewal   or NAT which don't understand EPRT, then the data connection from ftpd   to ftp client will fail.
Let ftp command use only PORT(no EPRT) for IPv4 destination.
  Because if ftpd is invoked with -R option, and EPRT is used via firewal
  or NAT which don't understand EPRT, then the data connection from ftpd
  to ftp client will fail.

Reported By: ume@mahoroba.org
Approved by: jkh

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