Add support for CONFIG_NET_SAMPLE_SEND_ITERATIONS option so that
this sample can be run multiple times against HTTP(s) server
that is running inside a Docker container.
Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
Use k_timeout_t internally, no change to user API.
Clarify the documentation of the timeout parameter that it is
in milliseconds.
Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>