[pca] Patch download fails

[Martin Paul]

Once again Oracle has changed its patch download infrastructure causing
PCA to fail when trying to download patches. If you see download errors
please try to use PCA with --wgetopt="--no-check-certificate".

Unfortunately I can not take a closer look at that right now for personal
reasons, so do not expect an updated version of PCA in the next days.

Best,
Martin.