Revert "(7080) Adding json support to Indirector Request"

This reverts commit e0615cbc1eea67ef8caf4edbc8b7b3d3ce618f4d.
The JSON patch series has caused problems with the inventory service,
and further discussion is needed to decide how to serialize objects to
PSON with regards to future compatibility.

Conflicts:

spec/unit/indirector/request_spec.rb

Paired-with:Matt Robinson <matt@puppetlabs.com>