* Refactor code using pyupgrade for Python 3.6
This diff is the result of applying the following command to the
project:
```shell
find . -type f -name "*.py" -exec pyupgrade --py36-plus '{}' +
```
* Simplify yield from
- We now automatically generate bootstrap_gen.py file from the list of instrumentations present in the source tree.
- Bootstrap command now uses consumes this auto-generated list instead of keeping it's own local copy.
- We no longer uninstall packages before installing them as instrumentation package no longer specify libraries as dependencies so the edge cases are no longer there.
- We no longer try to install an incompatible version or force upgrade/downgrade an installed version. This used to leave systems in broken states which should happen no more.
All instrumentations packages have almost exactly same setup.py files.
This commit adds a python script that generates it from a source
template. This dramatically reduces the time and effort required to
update all instrumentation setup.py files, and also reduces chances of
making manual mistakes.
