Replaced nexusproxy property with onap.nexus.url

Also removed redefined redefined nexusproxy and distribution Management from poms
Update ReadMe accordingly

Issue-ID: CPS-435

Change-Id: I02831e737587a1a16e9743773f2840c209d1fffd
Signed-off-by: mkerrigan <michael.kerrigan@est.tech>
Signed-off-by: ToineSiebelink <toine.siebelink@est.tech>
4 files changed