Revert "ASG healthcheck should be based on ELB healthcheck, not EC2 instance reachability (#233)"
Revert "ASG healthcheck should be based on ELB healthcheck, not EC2 instance reachability (#233)"

  - debugging issue bring apibuilder-app back up with AWS support who
    recommended reverting this change

This reverts commit 8cb3ba15386afdfd4683c3f49a8b739c13efd5bc.

flowcommerce/delta,flowcommerce/delta,flowcommerce/delta