radvd: add from OE-Classic, update and tidy up

radvd: add from OE-Classic, update and tidy up

* Update to 1.9.1
* Add libdaemon to DEPENDS as needed by 1.9+
* Remove empty config file (not really of much use and there's an
  example config in the -doc package anyway)
* Use useradd.bbclass to create user
* Handle hardcoded paths in initscript
* Add LSB headers to initscript (borrowed from openSUSE)
* Set custom LICENSE as it's BSD-Style but not actually one of the
  standard BSD variants
* Add LIC_FILES_CHKSUM
* Set SUMMARY (which sets DESCRIPTION)

(From meta-openembedded rev: 85c1a1a45409ffa064b5da8c8b00e7a5f7d67b83)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>