qos: make database name configurable

more flexibility in configuration

Acked-by: Dmitry Litvintsev
Target: master
Require-book: no
Require-notes: yes

skel/share/defaults/qos.properties

@@ -37,7 +37,7 @@ qos.db.connections.idle=1
 
 # ---- Database related settings reserved for internal use.
 #
-(immutable)qos.db.name=qos
+qos.db.name=qos
 qos.db.host=${dcache.db.host}
 qos.db.user=${dcache.db.user}
 qos.db.password=${dcache.db.password}