This makes it more likely that the trailer is received
seperately from the last-chunk.
curl doesn't seem to care about this but it makes the tests
more useful when testing external proxies like Privoxy.
When receiving chunked encoded data with trailers, and the write
callback returns PAUSE, there might be both body and header to store to
resend on unpause. Previously libcurl returned error for that case.
Added test case 1540 to verify.
Reported-by: Stephen Toub
Fixes#1354Closes#1357
