Add condition for setting current and target values from AverageValue on HPA renderer

[jpereiramp]

Fixes Issue #1440.

The proposed fix is to check for non-nil, non-zero current and target AverageValue values and, when found, use those when building the entry for the TARGETS% column when rendering an hpa object.

When no non-nil, non-zero AverageValue is found, we fallback to the existing case where the Value fields are used.

There are test cases for both Value and AverageValue cases.

[derailed]

@jpereiramp Thank you for this update! Looks like we have some conflicts...