test: streams: include explicit timestamp with bulk data writes
test: streams: include explicit timestamp with bulk data writes

This change adds timestamps to the bulk data writes.  Without this,
the device cloud would seem to sometimes provide back elements out
of the expected order when read back.  Technically, that behavior
cannot be considered wrong as all items were effectively put into
the stream at the same moment and they did not have any additional
information which would result in the expected ordinal return.

Signed-off-by: Paul Osborne <53d544264adec677b85cc2f4d9f73264543f832b@etherios.com>

brucetsao/python-devicecloud,digidotcom/python-devicecloud,michaelcho/python-devicecloud,michaelcho/python-devicecloud,digidotcom/python-devicecloud,brucetsao/python-devicecloud,ctrlaltdel/python-devicecloud,ctrlaltdel/python-devicecloud