DEVOPS-542 allow customized endpoint label#3

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chessracer wants to merge 8 commits intomasterfrom

feature/DEVOPS-542

Commits on Apr 16, 2018

DEVOPS-542 allow customized endpoint label
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merge master
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Commits on Apr 25, 2018

fix bad merge from master - it removed the SERVICE_LABEL_ENDPOINT env var
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Commits on May 4, 2018

DEVOPS-556 try restricting metadata call to self stack (optional), in order to prevent cross-stack registrations / deregistrations
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Commits on May 6, 2018

Aligns provider lookup vpcID with EC2 lookup vpc id. This was causing a bug where we were deregistering instances in other vpcs, that our vpc-specific metadata did not describe
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Commits on May 7, 2018