Updating ant task definitions to work better on new OS's:

1) tomcat7's lib directory is /var/lib/tomcat, not /var/lib/tomcat7
     Update tomcat property value and buildconf filename appropriately.

2) dependency problems prevent installation of some rpms from jpackage-generic
  a) ivy: can use OS's standard apache-ivy rpm instead of jpackage's ivy
     * ivy.14.compatible property makes ivy 2.x work with current tasks
     * ivy 2.x changed classpath from fr.jayasoft to org.apache. Both now work.
  b) ant-contrib: can use OS's standard ant-contrib instead of jpackage's
     * migrate from 'for' task to 'foreach' task