6366373 split-tree nightly doesn't work with pre-split workspaces

[mike.kup...@sun.com]

Author: kupfer
Repository: /hg/onnv/onnv-gate
Revision: 122814a830ef387a1f0ca94787415c5862ef2c64
Log message:
6366373 split-tree nightly doesn't work with pre-split workspaces

Files:
        update: usr/src/tools/scripts/nightly.sh