Rakfile: Use Kitchen ruby class instead of sh
Rakfile: Use Kitchen ruby class instead of sh

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