Use designated initializers in state_machine declaration
Use designated initializers in state_machine declaration

Currently s2n's state_machine for message handlers needs to declared in
the same order as the message_type_t enum.  This change uses designated
initializers to make that ordering explicit and (hopefully) makes the
code more readable.

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