René Kschamer

Adding utils.format_quantity

8

#### What type of PR is this? /kind feature #### What this PR does / why we need it: PR adds a `utils.format_quantity`, which converts a decimal number into a...

`format_quantity` function missing to convert Decimal values in to K8s quantity string

9

**What is the feature and why do you need it**: There is [`parse_quantity`](https://github.com/kubernetes-client/python/blob/master/kubernetes/utils/quantity.py) to convert a canonical K8s quantity into a `Decimal` value. However, an opposite function, like `format_quantity` is...