Document Docker for Mac Time Drift Problem

[osterman]

what

aws-vault: error: Failed to get credentials for example (source profile for example-staging-admin): SignatureDoesNotMatch: Signature expired: 20180806T044229Z is now earlier than 20180806T191638Z (20180806T193138Z - 15 min.)
    status code: 403, request id: 56541f26-99af-11e8-afc4-b591fcbce4e0

fix

Depending on if system clock or OS clock is right, use: Update system clock

• hwclock -w Update OS clock from system clock:
• hwclock -s

references

• https://github.com/docker/for-mac/issues/2076