Add new key length and extended key usage to parameter tables.
Add new key length and extended key usage to parameter tables.

Added length and extended_key_usage to namespace parameter list.

Added key_length and extended_key_usage parameter defaults and
description table

onddo/ssl_certificate-cookbook,onddo/ssl_certificate-cookbook,onddo/ssl_certificate-cookbook,zuazo/ssl_certificate-cookbook,zuazo/ssl_certificate-cookbook,zuazo/ssl_certificate-cookbook