fix loading of environment variables for managing aws waiters
fix loading of environment variables for managing aws waiters

tb3088/packer,tas50/packer,hashicorp/packer,timsutton/packer,tas50/packer,bryson/packer,mkuzmin/packer,paulmey/packer,grubernaut/packer,youhong316/packer,tas50/packer,timsutton/packer,grubernaut/packer,mitchellh/packer,tb3088/packer,dave2/packer,tb3088/packer,dave2/packer,ricardclau/packer,bryson/packer,pecigonzalo/packer,KohlsTechnology/packer,paulmey/packer,paulmey/packer,bryson/packer,tas50/packer,dave2/packer,mitchellh/packer,rnaveiras/packer,mkuzmin/packer,KohlsTechnology/packer,youhong316/packer,hashicorp/packer,grubernaut/packer,tb3088/packer,paulmey/packer,hashicorp/packer,tb3088/packer,rnaveiras/packer,ricardclau/packer,rnaveiras/packer,timsutton/packer,timsutton/packer,youhong316/packer,dave2/packer,mitchellh/packer,rnaveiras/packer,pecigonzalo/packer,tas50/packer,mkuzmin/packer,mkuzmin/packer,mitchellh/packer,KohlsTechnology/packer,youhong316/packer,tb3088/packer,tas50/packer,timsutton/packer,rnaveiras/packer,mitchellh/packer,bryson/packer,mkuzmin/packer,ricardclau/packer,pecigonzalo/packer,pecigonzalo/packer,ricardclau/packer,dave2/packer,KohlsTechnology/packer,rnaveiras/packer,grubernaut/packer,hashicorp/packer,timsutton/packer,grubernaut/packer,bryson/packer,bryson/packer,youhong316/packer,grubernaut/packer,mkuzmin/packer,paulmey/packer,ricardclau/packer,youhong316/packer,ricardclau/packer,KohlsTechnology/packer,dave2/packer,paulmey/packer,KohlsTechnology/packer