Use the first matching sigalg
Use the first matching sigalg

Previously we iterated thru the entire list. Short circuit and choose
the first match from the preference list.

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