This change adds LBS usage, statistics and status API with param
'enforcement_point_path' to support querying in a multi enforcement
point setup.
Change-Id: I08cbc05bbad6e70dbd3a1c96fba72931a94f0b7f
Signed-off-by: Shawn Wang <wshaoquan@vmware.com>
(cherry picked from commit 9341330fdb70d274905d056aebf84eb2819abd88)