Add test to verify SNI match is higher priority than cipher
Add test to verify SNI match is higher priority than cipher

This test verifies that s2n will select a certificate that matches the
domain name in the SNI extension before it will select a certificate
without a domain name match, irrespective of cipher preference.

awslabs/s2n,raycoll/s2n,PKRoma/s2n,awslabs/s2n,gibson-compsci/s2n,wcs1only/s2n,wcs1only/s2n,colmmacc/s2n,raycoll/s2n,PKRoma/s2n,alexeblee/s2n,PKRoma/s2n,colmmacc/s2n,raycoll/s2n,PKRoma/s2n,alexeblee/s2n,alexeblee/s2n,alexeblee/s2n,wcs1only/s2n,gibson-compsci/s2n,PKRoma/s2n,gibson-compsci/s2n,gibson-compsci/s2n,wcs1only/s2n,wcs1only/s2n,gibson-compsci/s2n,alexeblee/s2n,wcs1only/s2n,colmmacc/s2n,colmmacc/s2n,raycoll/s2n,awslabs/s2n,wcs1only/s2n,awslabs/s2n,colmmacc/s2n,PKRoma/s2n,raycoll/s2n,PKRoma/s2n,awslabs/s2n,colmmacc/s2n,PKRoma/s2n,raycoll/s2n,wcs1only/s2n,gibson-compsci/s2n,alexeblee/s2n,awslabs/s2n