feat(vault)!: enable certificate verification

mentioned in commit 7b0b8645

mentioned in merge request to-be-continuous/samples/python-library!41 (merged)

mentioned in merge request to-be-continuous/samples/php-cnb-on-kubernetes!68 (merged)

mentioned in merge request to-be-continuous/samples/golang-cnb-on-kubernetes!80

mentioned in merge request to-be-continuous/samples/angular-on-s3!241 (merged)

mentioned in merge request to-be-continuous/samples/python-docker-compose!30 (merged)

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mentioned in merge request to-be-continuous/samples/python-serverless-on-aws!208 (merged)

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mentioned in merge request to-be-continuous/samples/node-on-openshift!44

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mentioned in merge request to-be-continuous/samples/golang-on-cloudfoundry!91 (merged)

mentioned in merge request to-be-continuous/samples/golang-docker-on-aws!139 (merged)