BUG/MEDIUM: h1: In h1_init(), wake the tasklet instead of calling h1_recv().

BUG/MEDIUM: h1: In h1_init(), wake the tasklet instead of calling h1_recv().

In h1_init(), instead of calling h1_recv() directly, just wake the tasklet,
so that the receive will be done later.
h1_init() might be called from connect_server(), which is itself called
indirectly from process_stream(), and if the receive fails, we may call
si_cs_process(), which may destroy the channel buffers while process_stream()
still expects them to exist.

This should be backported to 1.9.