owfs: Add init scripts and config files

Owfs daemons lack control scripts. This patch adds init.d scripts for owfs,
owserver, owhttpd and owftpd packages.
Most daemon options (both common libow and program-specific parameters)
are reflected as uci config variables.

Signed-off-by: Marcin Jurkowski <marcin1j@gmail.com>

utils/owfs/files/owftpd.conf

@@ -0,0 +1,9 @@
+config owftpd 'owftpd'
+	option enabled 0
+	option uid 0
+	option gid 0
+	option readonly 0
+	option port 21
+	option error_level 0
+	option options ''
+	list devices '-s localhost:4304'