Add test to check a real database (pgsql) works

Add test to check a real database (pgsql) works

Change config template to e able to set up ipsilon with an extrenal
database.
For the easy install the database server must have 3 datbases configured,
and named exactly: admincondif, userprefs, transactions

If different names are required manual instalation will be necessary.
Database URLs (including credentials) can be set using the new option
named --database-url

Signed-off-by: Simo Sorce <simo@redhat.com>
Reviewed-by: Patrick Uiterwijk <puiterwijk@redhat.com>