Add missing '&' thus avoiding a copy of the properties for each class.
Add missing '&' thus avoiding a copy of the properties for each class.

Change-Id: I403c292209eb55a297def7cc63a4f3ebe87b9b5d
Signed-off-by: Rob Adams <dc34e1981fc17062c98433ad1bfcab20a4e3a66c@readams.net>

opendaylight/opflex,opendaylight/opflex,opendaylight/opflex,mhrobinson/opflex,mhrobinson/opflex,mhrobinson/opflex,opendaylight/opflex,mhrobinson/opflex