OpenBSM moving to GitHub

[Christian Brueffer]

We're pleased to announce the move of the OpenBSM source code
repository from the FreeBSD Perforce server to Github.After a
period of dormancy, we hope this will make the code more accessible
and stimulate outside contributions.

Since the converter (git-p4) could not export the release labels
from Perforce correctly, they were added to the git repository
by hand.  Thus, don't be alarmed by the recent tagging dates.

The repository can now be found at https://github.com/openbsm/openbsm

Christian Brueffer and Robert Watson on behalf of the OpenBSM project.