Added tomcat manager & registered log file

 * Added "tomcat7-admin" (the tomcat manager) to the list of
   packages to be installed.
 * Added a task to register tomcat's main log file (catalina.out)
   with the system logs (mainly for Webmin's sake)

Issue: IWSoftware/ekahau-rtls-playbook#1
Ticket: #5507

Signed-off-by: Nathan Callister <ncallister@iwsoftware.com.au>