test: move simple/test-http-dns-fail to test/internet

The test times out when the upstream DNS resolver takes too long to
respond.

See #4672.
net: initialize TCPWrap when receiving socket

TCPWrap::Initialize() and PipeWrap::Initialize() should be called before
any data will be read from received socket. But, because of lazy
initialization of these bindings, Initialize() method isn't called.

Init bindings manually upon socket receiving.

See #4669
stream: Correct Transform class backpressure

The refactor in b43e544140ccf68580c02e71c56d19b82e1e1d32 to use
stream.push() in Transform inadvertently caused it to immediately
consume all the written data, regardless of whether or not the readable
side was being consumed.

Only pull data through the _transform() process when the readable side
is being consumed.

Fix #4667
http: Don't dump twice
net: Set Socket._connecting to false in ctor