Description of problem:
Enki does not work without installed sphinx.

Version-Release number of selected component (if applicable):
enki-17.03.0-4.fc26.noarch

How reproducible:
yes

Steps to Reproduce:
1. dnf remove python3-sphinx
2. dnf install enki
3. try to start enki

Actual results:
Traceback (most recent call last):
  File "/usr/bin/enki", line 6, in <module>
    from pkg_resources import load_entry_point
  File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 3036, in <module>
    @_call_aside
  File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 3020, in _call_aside
    f(*args, **kwargs)
  File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 3049, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 654, in _build_master
    ws.require(__requires__)
  File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 968, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 854, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'Sphinx' distribution was not found and is required by enki

Expected results:
enki works.

Additional info:
Possible fix: dnf install python3-enki