Add alarms and transfermanager database to system-test setup

HSQLDB conection parameters are defined too, although the alarms schema
is limited to postgresql at the moment. For that reason and because
HSQLDB is a single process database, the alarms service uses the xml
store.

The httpd.alarms.* properties are marked immutable, as modifying many of
them will have no effect as they are not used as part of the definitions
of derived properties (e.g. changing httpd.alarms.db.type had no effect).

Target: trunk
Require-notes: no
Require-book: no
Acked-by: Albert Rossi <arossi@fnal.gov>
Patch: http://rb.dcache.org/r/6534/