ftpd: stop using -g flag for /bin/ls

In 3bfbb52 the behaviour of ls was changed such that -g was no longer
a noop for compatibility with BSD 4.3, but instead changed the output
of long mode to exclude the owner of the file and display only the
group.

Update how FTPd invokes ls to restore the previous behaviour

Reported-by:	Andrew Fengler <andrew.fengler@scaleengine.com>
Reviewed-by:	jrtc27, des, imp
MFC after:	3 days
Sponsored-by:	ScaleEngine Inc.
Fixes:		3bfbb52 ("ls: Improve POSIX compatibility for -g and -n.")

libexec/ftpd/ftpcmd.y

@@ -451,12 +451,12 @@ cmd
 	| LIST check_login CRLF
 		{
 			if ($2)
-				retrieve(_PATH_LS " -lgA", "");
+				retrieve(_PATH_LS " -lA", "");
 		}
 	| LIST check_login SP pathstring CRLF
 		{
 			if ($2)
-				retrieve(_PATH_LS " -lgA %s", $4);
+				retrieve(_PATH_LS " -lA %s", $4);
 			free($4);
 		}
 	| STAT check_login SP pathname CRLF

libexec/ftpd/ftpd.8

@@ -276,7 +276,7 @@ is specified.
 .It EPSV Ta "prepare for server-to-server transfer, multiprotocol"
 .It FEAT Ta "give information on extended features of server"
 .It HELP Ta "give help information"
-.It LIST Ta "give list files in a directory" Pq Dq Li "ls -lgA"
+.It LIST Ta "give list files in a directory" Pq Dq Li "ls -lA"
 .It LPRT Ta "specify data connection port, multiprotocol"
 .It LPSV Ta "prepare for server-to-server transfer, multiprotocol"
 .It MDTM Ta "show last modification time of file"

libexec/ftpd/ftpd.c

@@ -2321,7 +2321,7 @@ statfilecmd(char *filename)
 	struct stat st;
 
 	code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213;
-	(void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename);
+	(void)snprintf(line, sizeof(line), _PATH_LS " -lA %s", filename);
 	fin = ftpd_popen(line, "r");
 	if (fin == NULL) {
 		perror_reply(551, filename);