need to remove the temporary fix for KIE server using postgresql-42.2.2.jar

KIE server is using PostgreSQL 9.2 JDBC from rpm, which caused this bug: https://issues.jboss.org/browse/RHPAM-740

We are requesting the latest postgresql-42.2.2.jar rpm to be installed, before that I put in a temporary fix by adding the latest PostgreSQL JDBC to replace the old 9.2 JDBC. These are the PRs for the temp fix:

jboss-kie-modules: https://github.com/jboss-container-images/jboss-kie-modules/pull/21
rhpam-7-openshift-image: https://github.com/jboss-container-images/rhpam-7-openshift-image/pull/31

So once the new rpm is installed, we need to revert the temp fix.
The temp fix's code change are:
1) rhpam-7-openshift-image/kieserver/image.yaml, added:
+ - path: postgresql-42.2.2.redhat-2.jar
+ description: "temp fix for https://issues.jboss.org/browse/RHPAM-740, after the latest postgresql jar is provided from RPM, follow up work: https://issues.jboss.org/browse/RHPAM-785"
+ md5: 48a419e50c1524fe9612f8db6e31ccec

2) jboss-kie-modules/os.bpmsuite.executionserver/configure.sh, added these lines:

+POSTGRESQL_JAR=${SOURCES_DIR}/postgresql-42.2.2.redhat-2.jar
+if [ -f $POSTGRESQL_JAR ]; then
+ cp $POSTGRESQL_JAR /usr/share/java/postgresql-jdbc.jar
+fi