Change authentication configuration according to OpenWebif usage.
Add support for OpenWebIf on other port (!= 80). The value
is fetched from the enigma settings automatically.

Connect to the OpenWebIf "streaming service port" using
IPv6 (localhost), the only reason it wouldn't work, is
when IPv6 support is disabled completely on the reveiver
(which nowadays is never the case). It doesn't need any
explicit IPv6 setup.
Add inotify watch on /etc/enigma2/settings, so config
changes to the OpenWebIf settings (auth, port) are also
picked up immediately.
Add options to set webif port and webif auth requirement, this
is mainly for testing, as these values are normally always
found in the enigma settings file.