[CLEANUP] O'Reilly has clarified its license

[CLEANUP] O'Reilly has clarified its license

O'Reilly has clarified its license affecting 6 files contained in
haproxy up to and including 1.3.12.X. The updated license has been
included within these files.

These files are no longer present in versions starting from 1.3.13,
but it was better to clear any doubt about the redistribution
conditions at least for 1.3.12.

Special thanks to the people at the Fedora Project for their efforts
in getting in touch with O'Reilly to clarify the license.