Align persistence.moxy version
Align persistence.moxy version

Parent declaration has version 2.7.5, while features are using
version 2.7.3 -- align the two.

Change-Id: I172a164ebf7bb6675c77322aabb7597be67a34d7
Signed-off-by: Robert Varga <91ae5aa8c7a9f7e57b701db766e23e544aaa6ae9@pantheon.tech>

opendaylight/neutron