exportfs, oexportfs, iostats: make -d log to stderr

exportfs -d logs 9p traffic to /tmp/exportdb.
-f allows writing to a different file.
exportfs silently continues if it doesn't have
permissions to create or write to /tmp/exportdb.
These are poor behaviors.

A better default is to write to stderr, since it
is 9P debug info that is better immediately printed,
and not user info that is better handled by syslog().
As a result, -f is obsolete and thus removed.
Redirect responsibility is now on rc.
As a side effect, rc will fail if it doesn't
have permissions to write.

exportfs(4) is updated to reflect all changes
and with a better Synopsis.

oexportfs is changed to match exportfs.
oexportfs(4) is updated to reflect all changes.
The Synopsis is not changed due to the number of flags.

Removed -f from iostats.
iostats(4) is updated to reflect all changes.
---

1 files changed, 0 insertions, 1 deletions

diff --git a/sys/src/cmd/exportfs/exportfs.h b/sys/src/cmd/exportfs/exportfs.h
index 344304b7c..6723620cd 100644
--- a/sys/src/cmd/exportfs/exportfs.h
+++ b/sys/src/cmd/exportfs/exportfs.h
@@ -3,7 +3,6 @@
  */
 
 #define DEBUG		if(!dbg){}else fprint
-#define DFD		9
 #define fidhash(s)	fhash[s%FHASHSIZE]
 
 typedef struct Fsrpc Fsrpc;