vfs_ceph_new: log open-flags upon release-fh

vfs_ceph_new: log open-flags upon release-fh

Store the set of open O_XXX flags as part of the referenced file-handle
to allow more verbose debug-logging info upon close. This should ease
the developer's logging analysis where same inode is opened multiple
times but with different flags set.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15703

Signed-off-by: Shachar Sharon <ssharon@redhat.com>
Reviewed-by: Anoop C S <anoopcs@samba.org>
Reviewed-by: John Mulligan <jmulligan@redhat.com>