Change License for sub-libraries from GPLv2 only to LGPLv2.1+ ("or any later")

Change License for sub-libraries from GPLv2 only to LGPLv2.1+ ("or any later")

This includes crypto, loopaes, tcrypt handling code I have written myself
and verity code written originally by Mikulas Patocka and modified by me,
copyright by Red Hat.

Other part of library have to stay GPLv2+ only for now
(no agreement from all authors).