SrmSpaceManager: adapt to UniversalSpringCell instatntiation

Adapts SrmSpaceManager to be instantiated using UniversalSpringCell,
replaces debug with trace,
fixes issues with messageForwarding,
fixed CellPath#insert methods

RELEASE NOTES:

introduced the follwing variables:

spacemanager.service.pnfsmanager.timeout=300
spacemanager.service.pnfsmanager.timeout.unit=SECONDS

spacemanager.service.poolmanager.timeout=300
spacemanager.service.poolmanager.timeout.unit=SECONDS

spacemanager.db.password.file=${srmPasswordFile}

Acked-by: Gerd Behrmann
Require-notes: yes
Require-book: no
Target: trunk
Patch: http://rb.dcache.org/r/5864/
billing: Fix regression in billing flat file format rendering

Addresses a regression in rendering the configurable billing format
strings. A bug prevented these formats from being respected. Note
that the format strings are now preprocessed by the dCache
configuration system, which means that escape sequences are
processed. You may have to update custom format strings (in
$$ sequences have to be replaced by $$$$).

Target: trunk
Request: 2.7
Require-notes: yes
Require-book: yes
Acked-by: Albert Rossi <arossi@fnal.gov>
Patch: http://rb.dcache.org/r/6065/
Refactor BootLoader

The patch moves the part for loading the dCache configuration into
the new LayoutBuilder class.

Target: trunk
Require-notes: no
Require-book: no
Acked-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>
Patch: http://rb.dcache.org/r/6059/
pnfsmanager: Drop unused fields and methods

These fields were only kept for backwards compatibility with
version of dCache no longer supported.

Target: trunk
Require-notes: no
Require-book: no
Acked-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>
Patch: http://rb.dcache.org/r/6052/
poolmanager: Delete unused messages

Target: trunk
Require-notes: no
Require-book: no
Acked-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>
Patch: http://rb.dcache.org/r/6054/
Remove redundant and verbose code constructs

Target: trunk
Require-notes: no
Require-book: no
Acked-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>
Patch: http://rb.dcache.org/r/6055/
doors: allow Transfer to accept a subject to talk to namespace

allow transfer to use a different subject for namespace and pool
operations. Update NFS door to use it.

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