[SOC-828] Database configuration should not use macros/variables

Configuring the database for /socialdemo involves editing gatein/conf/configuration.properties file.

The database shcemas are cofigured with an ${name} macro which is not explicitely defined elsewhere. So this is error prone and dangerous.
We should have a mean to hard-conffigure the database for the socialdemo portal.

Example of problematic configuration :
 
\# JCR
gatein.jcr.datasource.url=jdbc:hsqldb:file:${gatein.db.data.dir}/data/jdbcjcr_${name}

\# IDM
gatein.idm.datasource.url=jdbc:hsqldb:file:${gatein.db.data.dir}/data/jdbcidm_${name}