Add sleeps when first calling yum install. Fixes issues with S3 vpc-endpoints not being immediately active.
Add sleeps when first calling yum install. Fixes issues with S3 vpc-endpoints not being immediately active.

RetailMeNotSandbox/dart,RetailMeNotSandbox/dart,RetailMeNotSandbox/dart,RetailMeNotSandbox/dart,RetailMeNotSandbox/dart