D-12568: fix broke %postun, add %postinstall, change release

The issues are:
1) Installing atomhopper RPM does not remove the old package
rpm -qa | grep atomhopper
shows multiple versions

2) Deploying ATOMHOPPER.war sometimes Tomcat does not explode the war file. We had to manually run "touch ATOMHOPPER.war" to get Tomcat to do it.