Certain Optional Dependencies Missing

[rybli]

While trying to create credential exes for credentialed scans I ran across the exes downloading as 0KB.

Did some digging and found that the install script does not contain a number of the optional dependencies required for creating credentialed scan packages and some other features.

Ran the following code found here: https://greenbone.github.io/docs/gvm-21.04/index.html#id22 and got credential scan packages working.

I will most likely work on editing the code and testing this week and do another pull request.

Just making an issue for those who may run into the same issue.

[yu210148]

Great, thanks. I do my scans uncredentialed so haven't noticed this. I'll keep an eye out for the pr.