Config updater bug - example repo provided

[adeebahmed]

Created an example repository here that brings attention to a configUpdater bug that we noticed when upgrading from 2.7.x to 2.8.x.

Hoplite 2.8.x now requires that all "LookupPreprocessor" style replacements that look like this:

value = "{{configValue}}"

be given in all lower case:

value = "{{configvalue}}"

This bug led to variables not being substituted correctly and confused us when developing locally, as this was not happening before. There are more details in the README of the example repository on how to reproduce on a local machine.