Bug 1848: Make sure that XmlStreamUtils preserve list key order.

Change-Id: I3d7a91c9ae4ec74b1c7130c4af504af73a2f4507
Signed-off-by: Tony Tkacik <ttkacik@cisco.com>
(cherry picked from commit 2d56be8a89b494cd8423a6377c9574966067aa88)
Merge "Bug 1848: Make sure that XmlStreamUtils preserve list key order." into stable/helium