Allow to override configuration files deployed by role

[sm97]

Use case - I need to override only two configuration files. Other files should go unmodified from distr.

tomcat_conf_templates:
  - { src: "server.xml.j2", dest: "{{ tomcat_conf_path }}/server.xml" }
  - { src: "setenv.sh.j2", dest: "{{ tomcat_bin_path }}/setenv.sh" }