The new "all" optional dependency target is intended to replicate the

old behavior of installing all python dependencies.

Documentation has been updated to reflect this.

Since this is just a change for pip dependencies I've done:

- pip install -e ./bot

- pip install -e ./bot[all]
To test if it installs and doesn't install buildbot under the default 

package and the "all" target, and according to the logs this is the case.