- fix boo#1021353: ocserv randomly misbuilds man pages
- add patch: boo1021353-ocserv-doc-racing-in-parallel-build.patch
* occtl and ocpasswd are both built from args.def, which
will cause a racing problem in parallel builds that autogen
write contents randomly. fixed by adding a prefix to make
them different in filename.

- update version 0.11.6
* cserv: Improved detection of mobile clients
* ocserv: Update the worker's ID on Radius accounting messages.
That is, even if we initially advertize the ID of the worker
handling the client as NAS-Port, the client may eventually end-up
being served by another process with different ID. In that case we make
sure that the radius server is notified on the next accounting message.
If you are using radius see doc/README.radius.md about NAS-Port, since
that behavior may cause issues in freeradius installations.
* ocserv: Added config option 'switch-to-tcp-timeout'. That allows an
automatic switch to TCP in case of no received UDP traffic for
certain time
* ocserv: Pre-load the OCSP response file; that way worker processes can
serve it, even if they have no access to it.
* ocserv: When compiled with GnuTLS 3.5.6 automatically set DH
parameters from the known set.