This is what most of tools understand, test_requires is something that
only python setup.py test uses.

https://www.python.org/dev/peps/pep-0508 is less verbose.

Used to remove shared parts that are no longer referenced.

With shared part installed for example in `/opt/slapgrd/shared/name/HASH`
the heuristic is to assume that if `HASH` is present in a software's
`.installed.cfg`, then this software is using this shared part.
Similar, if `HASH` is present in
`/opt/slapgrid/shared/another/ANOTHER_HASH/.slapos*signature` then share
part another for hash `ANOTHER_HASH` is using the shared part.

This also have some support to recursively look in instances and if they
contain a `slapos.cfg` file, look for software and shared parts to see if
they use the shared part.

In other cases, this shared part can be deleted.

/reviewed-on nexedi/slapos.core!139

  Introduce a new command for run promises only, from all partitions. This helps to perform quick
  checks.

  Now a user can get a token from a configured slapos client or slapos console.

  The user could use the API to list computers or installations

subprocess32 backports the good things from python3's subprocess and is
recommended on https://docs.python.org/2/library/subprocess.html

Also cleanup and have a beginning of good basis to build a real navigator.

Major changes
  Rename pymonitor, add dependency and simplify
  Save all information using sqllite
  Record information from all processes individually
  Implement Snapshot for Computer and Systems information
  General Clean up

Major changes
  Rename pymonitor, add dependency and simplify
  Save all information using sqllite
  Record information from all processes individually
  Implement Snapshot for Computer and Systems information
  General Clean up

  This new command aims to be used on linux start up. It wait until
  network is up (ipv4 and ipv6), them it runs slapos node format and bang.

  It removes the .timestamp on all partitions, in order to force re-run.

These are just optional dependencies to enhance slap console, which works fine
with the default python interpreter, so they should not be required.

To copy those files we should check first if exists because after generate the
egg those files does not exist anymore and it blocks to install the package

both ipython and bpython are built and provided with slapos. bpython is the
default now, with colorful drop down menus. we can choose later.