http server use both settimeout and makefile

[Vincent Ladeuil]

http://docs.python.org/lib/socket-objects.html says:

...
A consequence of this is that file objects returned by the makefile() method must only be used when the socket is in blocking mode; in timeout or non-blocking mode file operations that cannot be completed immediately will fail.
...

So we must not use timeouts in HttpServer.

This has caused problems on Mac OS X for a long time and we tried to address them by retrying on socket.error.EAGAIN (Resource temporarily unavailable).

Lately, this has also make a test fail for the webdav plugin (namely test_readv_with_adjust_for_latency) which is using unsually (for the test suite) big files (200K and then 1M). And for these sizes the retry workaround just fails.

Now, it seems that originally this timeout was introduced to avoid hanging the test suite.

I think this is a different problem that should be addressed by the test suite itself in a more general way.