Fixed issue with new pip on coveralls link dependency
Fixed issue with new pip on coveralls link dependency

Details:

* The minimum-constraints.txt file contained a link dependency to a local fork
  of the python-coveralls repo for py27. The new pip version refuses to accept
  that.

  Fixed by disabling the dependency in minimum-constraints.txt as it is already
  defined in the dev-requirements.txt file.

Signed-off-by: Andreas Maier <38dbb04957d222ea6ce72de72413b1e55e665472@de.ibm.com>

zhmcclient/python-zhmcclient,zhmcclient/python-zhmcclient