Does not use env vars

[josersleal]

using aws-vault which creates a sub-process in bash
using mfa for role based auth
these envs are created:
$ aws-vault exec jonsmith -- env | grep AWS
AWS_VAULT=jonsmith
AWS_DEFAULT_REGION=us-east-1
AWS_REGION=us-east-1
AWS_ACCESS_KEY_ID=%%%
AWS_SECRET_ACCESS_KEY=%%%
AWS_SESSION_TOKEN=%%%
AWS_CREDENTIAL_EXPIRATION=2020-04-16T11:16:27Z

expected: extension connects successfully

actual: extension does not connect. generates error
"Unable to locate credentials. You can configure credentials by running "aws configure". E0430 12:21:52.147831 194139 memcache.go:265] couldn't get current server API group list: Get "https://6F753C08CB5B073408D87E9B6A225BB4.yl4.eu-north-1.eks.amazonaws.com/api?timeout=32s": getting credentials: exec: executable aws failed with exit code 253"