This patch moves the current behaviour from CloudConfigPlugin.process
to another function, process_non_multipart, which handles data
in the yaml format. Also, the 'process' function obtains the payload
of the parameter and passes it to the process_non_multipart
function.
Change-Id: I49e214771a17090e842f90f1ad34ca9e37c3021d
Closes-Bug: #1409268