Upgrade docker to 18.06 on Appliance and DCH

[DanielXiao]

Upgrade docker to docker-18.06.2-1.ph2 on Appliance and DCH. This version include patch for CVE-2019-5736.

VIC Appliance Checklist:

• [ ] Up to date with master branch
• [ ] Added tests
• [ ] Considered impact to upgrade
• [ ] Tests passing
• [ ] Updated documentation
• [ ] Impact assessment checklist

If this is a feature or change to existing functionality, consider areas of impact with the Impact Assessment Checklist

Fixes #