weedfuse: adapt to fstab command line pattern

weed/command/weedfuse/README.md

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+Mount the SeaweedFS via FUSE
+
+# Mount by fstab
+
+
+```
+$ # on linux
+$ sudo apt-get install fuse
+$ sudo echo 'user_allow_other' >> /etc/fuse.conf
+$ sudo mv weedfuse /sbin/mount.weedfuse
+
+$ # on Mac
+$ sudo mv weedfuse /sbin/mount_weedfuse
+
+```
+
+On both OS X and Linux, you can add one of the entries to your /etc/fstab file like the following:
+
+```
+# mount the whole SeaweedFS
+localhost:8888/    /home/some/mount/folder  weedfuse
+
+# mount the SeaweedFS sub folder
+localhost:8888/sub/dir    /home/some/mount/folder  weedfuse
+
+# mount the SeaweedFS sub folder with some options
+localhost:8888/sub/dir    /home/some/mount/folder  weedfuse  user
+
+```
+
+To verify it can work, try this command
+```
+$ sudo mount -av
+
+...
+
+/home/some/mount/folder           : successfully mounted
+
+```
+
+If you see `successfully mounted`, try to access the mounted folder and verify everything works.
+
+
+To debug, run these:
+```
+
+$ weedfuse -foreground localhost:8888/ /home/some/mount/folder
+
+```
+
+
+To unmount the folder:
+```
+
+$ sudo umount /home/some/mount/folder
+
+```
+
+<!-- not working yet!
+
+# Mount by autofs
+
+AutoFS can mount a folder if accessed.
+
+```
+# install autofs
+$ sudo apt-get install autofs
+```
+
+Here is an example on how to mount a folder for all users under `/home` directory.
+Assuming there exists corresponding folders under `/home` on both local and SeaweedFS.
+
+Edit `/etc/auto.master` and `/etc/auto.weedfuse` file with these content
+```
+$ cat /etc/auto.master
+/home    /etc/auto.weedfuse
+
+$ cat /etc/auto.weedfuse
+# map /home/<user> to localhost:8888/home/<user>
+* -fstype=weedfuse,rw,allow_other,foreground :localhost\:8888/home/&
+
+```
+
+-->