opal: upgrade at version 2.6

I haven't officially tagged yet the 2.6 but this package was create at
commit 9dd706bbcc67b8ab11ba5d6c35e5d6801ab0cd0e of opaltoolkit
Most likely I will cut the 2.6 from there...
fix tomcat connector

apache modules are not stored in /usr/lib64/httpd/modules and not
anymore in /etc/httpd/modules

This patch fixes this problem
remove creation of user ssh keys

Since now rocks uses host based authentication we don't need
anymore to set up user ssh keys
fix opal installation path

opal should installed in /opt/tomcat
node.xml: use new deployment
node.xml: fix bug with opal.properties configuration
node.xml: open http on opal-server appliances