To ensure that the generated man page also contains a license, move
the license text down into the POD.

Change-Id: Iaeedfbffccd1510d50bf1f84f396e1b1f8fda8fc
Reviewed-on: https://gerrit.stanford.edu/1562


Reviewed-by: Russ Allbery <rra@stanford.edu>
Tested-by: Russ Allbery <rra@stanford.edu>