insane.bbclass: Update insane.bbclass to work on FIPS enabled hosts

insane.bbclass: Update insane.bbclass to work on FIPS enabled hosts

hashlib.md5() is not permitted on a FIPS enabled host system.  This is due
to md5 not being an approved hash algorithm.

Instead use:
 hashlib.new('MD5', usedforsecurity=False)

This is allowed, as it's clear the hash is used for a non-security purpose.

Using an md5 to identify when a license has changed is permitted, as we're
not using it for file integrity.

Signed-off-by: Mark Hatle <mark.hatle@xilinx.com>
Signed-off-by: Mark Hatle <mark.hatle@kernel.crashing.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>