Bug 12827: NewOrder needs more unit tests

Bug 12827: NewOrder needs more unit tests

NewOrder should be more tested!

This patch moves the existing unit tests into a new file and adds some
unit tests.

Note that there is no DB field aqorders.subscription, so the test in
NewOrder can be removed.

Test plan:
  prove t/db_dependent/Acquisition/NewOrder.t
and
  prove t/db_dependent/Acquisition.t
should return green.

Signed-off-by: Zeno Tajoli <z.tajoli@cineca.it>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>