Previously, RestAssuredRequestConverter only supported request and
request part content that was null, a String or a byte[]. This was
particularly problematic for multipart requests as RestAssured performs
some internal conversion which meant that, no matter what the when a
byte[] was provided it was wrapped in a ByteArrayInputStream meaning
that the converter could not read it.
The commit improves RestAssuredRequestConverter so that it will now
convert File content and InputStream content where the stream supported
reset().
Closes gh-252
417547e61a