Add header param support to testing package

To make the testing package more robust we will need to add support for header parameters.

added Enhancement statewip team:webdev labels

assigned to @zacharysabourin

mentioned in commit zacharysabourin/eclipsefdn-api-common@c9b89d33

mentioned in merge request !54 (merged)

added statereview label and removed statewip label

closed with merge request !54 (merged)