dont log error when redis fails to connect if it is not required

[acatl]

Problem description:

when using data-point-cache it console errors if redis is not available, even if required flag is off

Suggested solution:

only show error, and warning if is flag required is on:

https://github.com/ViacomInc/data-point/blob/4fe693bacb3282ff25e561e2f5a1f8387d3b8fa6/packages/data-point-service/lib/factory.js#L39-L47

Environment:

• data-point version:
• node version:
• npm version: