Test: fix test_sigpipe of the ClientTest suite

There are two fixes required:
1. The request payload size needs to be increased on Linux to guarantee
that more than one send is required.
2. Due to the peculiarities of how closed connections are handled in Linux
[1, 2], an explicit socket shutdown is required in order to get a  EPIPE
error rather than a ECONNRESET.

Closes #53

1. https://stackoverflow.com/a/33053926
2. https://stackoverflow.com/a/2979806

test/ClientTest.cpp

@@ -712,12 +712,9 @@ test_sigpipe(Connector<BUFFER, NetProvider> &client)
 	 * Create a large payload so that request needs at least 2 `send`s, the
 	 * latter being written to a closed socket.
 	 */
-	rid_t f = conn.space[0].replace(std::vector<uint64_t>(100000, 777));
+	rid_t f = conn.space[0].replace(std::vector<uint64_t>(500000, 777));
 	fail_if(client.wait(conn, f, WAIT_TIMEOUT) == 0);
-#ifdef __FreeBSD___
-	/* FIXME(gh-53) reenable the test if possible. */
 	fail_unless(conn.getError().saved_errno == EPIPE);
-#endif
 	fail_if(conn.futureIsReady(f));
 }
 

test/Utils/System.hpp

@@ -265,6 +265,7 @@ launchDummyServer(const char *addr, int port)
 		::exit(EXIT_FAILURE);
 	}
 
+	::shutdown(accepted_sock, SHUT_RDWR);
 	::close(accepted_sock);
 
 	::exit(EXIT_SUCCESS);