(-Djboss.dist) jboss.dist property is not correctly propagated using -Djboss.dist

This JIRA is clone of bz-970610 (https://bugzilla.redhat.com/show_bug.cgi?id=970610)

When I run testsuite of EAP 6.1.0 using command [1], where JBOSS_HOME is a path EAP 6.1.0, the manualmode tests fail with error [2]:

It uses path defined in jboss.dist property defined in testsuite/integration/pom.xml instead of the one provided -Djboss.dist which should redefine it.

[1] ./integration-tests.sh -Dpublic-repos -DallTests -Dmaven.repo.local=${MAVEN_REPO_LOCAL} -Djboss.dist=${JBOSS_HOME} -Dmaven.test.failure.ignore=true -Dsurefire.forked.process.timeout=3600

[2]
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-antrun-plugin:1.7-redhat-1:run (build-manual-mode-servers) on project jboss-as-ts-integ-manualmode: An Ant BuildException has occured: The following error occurred while executing this line:
[ERROR] /mnt/hudson_workspace/workspace/eap-60-as-testsuite-one-offs-rhatlapa/jboss-eap-6.1-src/testsuite/integration/src/test/scripts/manualmode-build.xml:52: /mnt/hudson_workspace/workspace/eap-60-as-testsuite-one-offs-rhatlapa/jboss-eap-6.1-src/build/target/jboss-as-7.2.0.Final-redhat-8/modules does not exist.
[ERROR] around Ant part ...<ant antfile="/mnt/hudson_workspace/workspace/eap-60-as-testsuite-one-offs-rhatlapa/jboss-eap-6.1-src/testsuite/integration/manualmode/../src/test/scripts/manualmode-build.xml">... @ 4:180 in /mnt/hudson_workspace/workspace/eap-60-as-testsuite-one-offs-rhatlapa/jboss-eap-6.1-src/testsuite/integration/manualmode/target/antrun/build-main.xml