ae: make stagger function pluggable for testing
ae: make stagger function pluggable for testing

kingland/consul,scalp42/consul,42wim/consul,youhong316/consul,i0rek/consul,scalp42/consul,youhong316/consul,hashicorp/consul,scalp42/consul,i0rek/consul,scalp42/consul,vamage/consul,42wim/consul,42wim/consul,hashicorp/consul,i0rek/consul,calgaryscientific/consul,vamage/consul,42wim/consul,kingland/consul,hashicorp/consul,i0rek/consul,i0rek/consul,hashicorp/consul,vamage/consul,scalp42/consul,kingland/consul,youhong316/consul,youhong316/consul,calgaryscientific/consul,calgaryscientific/consul,42wim/consul,youhong316/consul,kingland/consul,vamage/consul,kingland/consul,vamage/consul,calgaryscientific/consul,calgaryscientific/consul