Initial implementation.

nr_rlc/nr_rlc_oai_api.c will need some clean rewrite at some point.

More testing is also needed.

This changes the destroy_link_manager() function to:
* call a new function message_get_unlock() to unlock the sending thread from
  its blocking message_get()
* calls pthread_cancel() on the receiving thread, because this unlocks any
  blocking read from a file descriptor

The same message_get_unlock() function has been added ringbuffer_queue to keep
the interfaces the same (it does nothing, because ringbuffer_queue is
non-blocking).

For whatever reason most of the files had their permission
changed from 644 to 755, which is not wanted.

git-svn-id: http://svn.eurecom.fr/openair4G/trunk@7885 818b1a75-f10b-46b9-bf7c-635c3b92a50f

astyle  --recursive --indent=spaces=2 --style=kr  --indent-col1-comments --break-blocks --convert-tabs --max-code-length=200

This is done for better merging branch/LG_PRE_RELEASE_0.3 into trunk (same process is applied on this branch)

git-svn-id: http://svn.eurecom.fr/openair4G/trunk@7073 818b1a75-f10b-46b9-bf7c-635c3b92a50f

git-svn-id: http://svn.eurecom.fr/openair4G/trunk@5714 818b1a75-f10b-46b9-bf7c-635c3b92a50f

git-svn-id: http://svn.eurecom.fr/openair4G/trunk@5578 818b1a75-f10b-46b9-bf7c-635c3b92a50f

Pre-ci test passed

git-svn-id: http://svn.eurecom.fr/openair4G/trunk@4000 818b1a75-f10b-46b9-bf7c-635c3b92a50f