DOC: create a doc to explain how to listen on port 80 instead of 8080

Create a doc to explain how to listen on port 80 instead of 8080 with tomcat.

WIP:

Edit Tomcat config:

in /var/lib/tomcat7/conf/server.xml
<Connector connectionTimeout="20000" port="8080" protocol="HTTP/1.1" redirectPort="8443"/>
=> <Connector connectionTimeout="20000" port="80" protocol="HTTP/1.1" redirectPort="8443"/>

in /etc/default/tomcat7
#AUTHBIND=no
=>AUTHBIND=yes

Install authbind:

sudo apt-get install authbind

To check/validate maybe useless (at least the touch command), give read/exec permissions to tomcat on port 80:

sudo touch /etc/authbind/byport/80
sudo chmod 500 /etc/authbind/byport/80
sudo chown tomcat7 /etc/authbind/byport/80

Remove the port in /usr/share/tomcat7/.TXMWEB/txm/txmweb.conf

portal_address=http://127.0.0.1:8080/txm/
=> portal_address=http://127.0.0.1/txm/

Restart Tomcat.

(from redmine: issue id 1604, created on 2015/12/08 by Sebastien Jacquot)

added type::doc type::task + 1 deleted label

changed milestone to %Portal 0.7

removed type::task label

changed the description