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>
diff --git a/cps-parent/pom.xml b/cps-parent/pom.xml
index 78a89f0..a341ea9 100755
--- a/cps-parent/pom.xml
+++ b/cps-parent/pom.xml
@@ -37,16 +37,10 @@
 
     <properties>
         <app>org.onap.cps.Application</app>
-        <docker.repository.push>nexus3.onap.org:10003/</docker.repository.push>
-        <docker.repository.pull>nexus3.onap.org:10001/</docker.repository.pull>
         <java.version>11</java.version>
         <jsonschema2pojo-maven-plugin.version>1.1.1</jsonschema2pojo-maven-plugin.version>
         <minimum-coverage>0.9</minimum-coverage>
-        <nexusproxy>https://nexus.onap.org</nexusproxy>
         <oparent.version>3.1.0</oparent.version>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <releaseNexusPath>/content/repositories/releases/</releaseNexusPath>
-        <snapshotNexusPath>/content/repositories/snapshots/</snapshotNexusPath>
         <spotbugs-maven-plugin.version>4.1.3</spotbugs-maven-plugin.version>
         <spotbugs.slf4j.version>1.8.0-beta4</spotbugs.slf4j.version>
         <spotbugs.bug-pattern.version>1.5.0</spotbugs.bug-pattern.version>
@@ -73,19 +67,6 @@
         </sonar.coverage.jacoco.xmlReportPaths>
     </properties>
 
-    <distributionManagement>
-        <repository>
-            <id>ecomp-releases</id>
-            <name>ECOMP Release Repository</name>
-            <url>${nexusproxy}${releaseNexusPath}</url>
-        </repository>
-        <snapshotRepository>
-            <id>ecomp-snapshots</id>
-            <name>ECOMP Snapshot Repository</name>
-            <url>${nexusproxy}${snapshotNexusPath}</url>
-        </snapshotRepository>
-    </distributionManagement>
-
     <dependencyManagement>
         <dependencies>
             <dependency>
@@ -346,7 +327,7 @@
                             see https://www.testcontainers.org/features/configuration/#disabling-ryuk
                          -->
                         <TESTCONTAINERS_RYUK_DISABLED>true</TESTCONTAINERS_RYUK_DISABLED>
-                        <TESTCONTAINERS_HUB_IMAGE_NAME_PREFIX>${docker.repository.pull}library/</TESTCONTAINERS_HUB_IMAGE_NAME_PREFIX>
+                        <TESTCONTAINERS_HUB_IMAGE_NAME_PREFIX>${docker.pull.registry}/library/</TESTCONTAINERS_HUB_IMAGE_NAME_PREFIX>
                     </environmentVariables>
                 </configuration>
             </plugin>