http: state machine fix

http: state machine fix

When client sends second request without waiting for response of the
first request http_ts_rx_callback should drop request (pipelining is
not supported) instead of invoking return to state machine which can
lead to erroneous state, e.g. reading random data from server app
fifo.

Added simple http static server url handler for testing to simulate
long running request processing, for now hardcoded delay 5 seconds.

Type: fix

Change-Id: Ied9f7e2e4ee64c982f045c0f7f99a2dc5d7a2108
Signed-off-by: Matus Fabian <[email protected]>