[SSSD] [sssd PR#175][opened] Add module for starting services

[lslebodn]

URL: https://github.com/SSSD/sssd/pull/175
Author: lslebodn
 Title: #175: Add module for starting services
Action: opened

PR body:
"""
This is a WIP version of reducing code duplication in our cwrap integration tests.

I am still not sure whether we should also reuse function `create_sssd_fixture`.
And if yes; then probably in different nodule then `services`

And comments are welcome.

BTW I wrote patches few weeks ago; therefore new tests are not converted.
I am just sending patches to get some feedback.

Site effect of this patches is that tests are cca 20% faster (IIRC)
"""

To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/175/head:pr175
git checkout pr175