db: drop the obfuscation of database password

fill up the /etc/ovirt-engine/engine.conf.d/10-setup-database.conf
with all database parameters as distinct parameters, to ease future
read.

Change-Id: I1da760e32ddef238324fe9889c1675de518d0c64
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=958532
Signed-off-by: Alon Bar-Lev <alonbl@redhat.com>