Wrap calls to network in Jenkinsfile in retry() blocks

[justaddcoffee]

Describe the desired behavior

Our pipeline sometimes fails on networks calls, for example this git clone fail and this pip install fail.

So, we should wrap git clones and pip installs in retry() blocks. As always, aping the GO pipeline is considered helpful.

[justaddcoffee]

Closing this, since we haven't seen this problem in a long time