The unit tests for python_dir fact were giving a false failure

```
1) python_dir is empty string if python not installed
   Failure/Error: expect(Facter.fact(:python_dir).value).to eq('')
     expected: ""
          got: "/usr/lib/python2.7/site-packages"
     (compared using ==)
```

If they were executed on a system where `/usr/libexec/platform-python`
was present - not the case (presumably) for Travis CI.

Ignore more installed versions of python during tests

Refixes #901

The bug was that a ReportRelative configuration to the load
plugin for collectd 5.9.0 was causing a parse error.
It has been fixed for 5.9.1

collectd module now skips this configuration for collectd for collectd == 5.9.0
Previously it was '!=' 5.9.

* Upsteam bug for collectd: #901
* Previous incorrect commit: 8edc014

Skip Load:ReportRelative as problematic for collectd 5.9.0

There was a name clash between:
* Puppet created configuration file.
* Package provided configuration file which was being purged.

Since a864d0d the collectd module on RedHat
purges the package provided file file `/etc/collectd.d/processes-config.conf`

The module was also creating this file with a concat and result was no
file on system.

To avoid the clash puppet now creates the file `processes_config.conf`. Note
the `-` vs `_`.

There is probably a cleaner fix to move all of the processes plugin configuration
into the per module file `/etc/collect.d/10-processses.conf` as that would
be more consistant with other simpler modules using a single template
rather than a concat. This would be a change for every module
however with `collectd::plugin` itself changing.

Fixes #926

Add Plugin Log parser

Create processes plugin configuration on RedHat

Release 11.4.0