buildroot

easy-rsa: new package

[Peter: Mention that openssl is a runtime dependency,
	Add license info as noted by Romain, add gpl-2.0.txt,
	Add comment explaining the missing build step,
	Use install -t for x509-types files]
Signed-off-by: Julien Viard de Galbert <julien@vdg.name>
Reviewed-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>