Add license info to ccrypt, haveged, rng-tools, vsftpd

I added license info to those packages that I have imported here.

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>
Merge pull request #170 from hnyman/add-license-info

Add license info to ccrypt, haveged, rng-tools, vsftpd