Fix generate_pkcs12_bundle for FIPS

generate_pkcs12_bundle used the PKCS12 class of the pyOpenSSL module
which is not compliant with FIPS (uses SHA1).
Switch to the cryptography module for generating the PKCS bundles unless
for really old releases (<=3.0) that don't support it (stable/train is
still on 2.8).

Change-Id: Ibd50e9a6e406683b7faba093d716c83d2b994ad7
1 file changed