SDP-1397: remove now-redundant manual 'chown -R root:root sdp' step from the OS Package Structure upgrade procedure (section 6.3.1.2).
sdp_upgrade.sh's STEP 9 already does 'chown -R root:root $ImmutableSDPDir' unconditionally whenever Package Structure is in use -- confirmed live: tar extraction as root actually leaves the tree with the tarball's original packaging-machine UID/GID (not root, since the tarball preserves numeric ownership metadata), but sdp_upgrade.sh's STEP 9 corrects this fully with zero manual intervention. This was very likely the original problem the manual chown workaround was added for; it's been reliably handled by the script itself for a long time now. Verified with a real install + upgrade test.