Remove command to rm non-existent directory

[idlewis]

At the point in the dockerfiles where /output/workarea is removed, the directory doesn't exist, as /output is a symlink that hasn't been created yet. However, removing the real workarea directory slows down server startup, so fix up the dockerfiles by removing the duff command (rather than correcting it to remove the real workarea directory)

[leochr]

@idlewis It could be the removal of /output/workarea inside populate_scc.sh that slowed down the server startup (from this PR ).

Could you please compare with just deleting the correct directory ($WLP_OUTPUT_DIR/defaultServer/workarea) in Dockerfiles?