Fix boot from ZFS issues

* Correct ZFS snapshot listing
* Disable "lvm is not available" message on quiet boot

Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alar Aun <spamtoaun@gmail.com>
Closes #6700 
Closes #6747

contrib/initramfs/scripts/local-top/zfs

@@ -44,7 +44,7 @@ activate_vg()
 {
         # Sanity checks
         if [ ! -x /sbin/lvm ]; then
-                message "lvm is not available"
+                [ "$quiet" != "y" ] && message "lvm is not available"
                 return 1
         fi
 

contrib/initramfs/scripts/zfs

@@ -579,10 +579,10 @@ ask_user_snap()
 	    eval `echo SNAP_$i=$snap`
 	    i=$((i + 1))
 	done <<EOT
-$("${ZFS}" list -H -oname -tsnapshot "${fs}")
+$("${ZFS}" list -H -oname -tsnapshot -r "${fs}")
 EOT
 
-	echo -n "  Snap nr [0-$((i-1))]? " > /dev/stderr
+	echo -n "  Snap nr [1-$((i-1))]? " > /dev/stderr
 	read snapnr
 
 	# Re-enable debugging.