nfs: lower nfs-client workaround message

Motivation:
NFS door logs a message when a client-side bug workaround is applied.
This was useful during debugging, but in production generates far too
many log entries. Moreover, admins can 't do noting about it.

Modification:A
lower nfs-client workaround message

Result:
Less useless messages in logs under normal operation.

Acked-by: Karen Hoyos
Target: master, 11.1, 11.0, 10.2
Require-book: no
Require-notes: yes
(cherry picked from commit fe4d189)
Signed-off-by: Tigran Mkrtchyan <[email protected]>

Author: kofemann

modules/dcache-nfs/src/main/java/org/dcache/chimera/nfsv41/door/NFSv41Door.java

@@ -1572,7 +1572,7 @@ abstract private class NfsTransfer extends RedirectedTransfer<PoolDS> {
                          *
                          * see: https://bugzilla.redhat.com/show_bug.cgi?id=1901524
                          */
-                        _log.warn(
+                        _log.info(
                               "Deploying work-around for buggy client {} issuing CLOSE before LAYOUT_RETURN for transfer {}@{} of {}",
                               t.getMoverId(), t.getPool(), t.getPnfsId(),
                               t.getClient().getRemoteAddress());