this change makes handshake and x509storeissuer command

[Sashan]

line option consistent with other tools.

the consistency here means the thread count is always the last argument.

to run the handshake test one does: ./handshake -t path/to/openssl.src/tests/certs 4

Fixes: 10

[t8m]

Merged with slightly reworded commit message. Thank you.