gplazma: Comply with new configuration policy

The option to implicitly embed gPlazma as a 'module' has been
removed. Instead one can now add a local gplazma service to a
domain and choose not to export it by setting gplazma.cell.export
to false. This has the same effect.

The ability for plain ftp to not use gPlazma at all and use a
local kpwd file has been removed. The same effect can be achieved
by configuring a local gplazma service and let the ftp door use it.

New properties

gplazma.cell.name
gplazma.cell.limits.threads
gplazma.cell.export
gplazma.service.pnfsmanager

Obsolete properties

kpwdFile
useGPlazmaAuthorizationModule
useGPlazmaAuthorizationCell

Removed properties

gplazma.version

Target: trunk
Require-book: yes
Require-notes: yes
Acked-by: Paul Millar <paul.millar@desy.de>
Patch: http://rb.dcache.org/r/5722/