Drops pid files, no longer needed with procd management.
Now properly reloads on reload_config after UCI changes.

Signed-off-by: Karl Palsson <karlp@etactica.com>

[ Fixed two shellcheck warnings and bump PKG_RELEASE ]
Signed-off-by: Michael Heimpold <mhei@heimpold.de>

u²pnpd announces a device as UPnP basic device on the
network so that an user could easily find it. It tries
to detect various system information automatically, however
everything can be overridden by UCI settings.

Signed-off-by: Michael Heimpold <mhei@heimpold.de>