tests: add two HTTP over UNIX socket tests

test1435: a simple test that checks whether a HTTP request can be
performed over the UNIX socket. The hostname/port are interpreted
by sws and should be ignored by cURL.

test1436: test for the ability to do two requests to the same host,
interleaved with one to a different hostname.

Signed-off-by: Peter Wu <peter@lekensteyn.nl>