srm: Avoid use of legacy PnfsGetFileMetaDataMessage

Besides removing the use of a legacy message, the patch resolves
a race condition in the directory creation code for uploads. The
old code tried to optimize the kind of meta data that was fetched
from PnfsManager, however since several uploads may interact, this
optimization could lead to errors as one upload would fetch meta
data reused by another upload.

Target: trunk
Require-notes: no
Require-book: no
Acked-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>
Patch: http://rb.dcache.org/r/6263/
pnfsmanager: Drop legacy PnfsGetFileMetaDataMessage

Target: trunk
Require-notes: no
Require-book: no
Acked-by: Paul Millar <paul.millar@desy.de>
Patch: http://rb.dcache.org/r/6265/