Add check of OS for the systemd unitfile

[surprisingb]

As the systemd.unit man page states on a Debian based OS,
the unit files should be put in /lib/systemd/system instead of /usr/lib/systemd/system, otherwise the module fails on Debian.

[lionce]

Hello @surprisingb ,

Thank your for your contribution. It looks like the unit tests are failing because of trailing whitespace error.

manifests/instance_service.pp - ERROR: trailing whitespace found on line 102
manifests/instance_service.pp - ERROR: trailing whitespace found on line 104
manifests/instance_service.pp - ERROR: trailing whitespace found on line 106

In order to merge your PR, please fix the errors.

[surprisingb]

Hi @lionce,
sorry for the late reply. I removed the trailing whitespaces, the unit tests should be ok now.
Thanks

[lionce]

Hello @surprisingb ,

I ran the acceptance tests through all our testing platforms and they are failing for redhat5, centos5, oracle5 and oracle6 with the same error when it's trying to run the following command: /usr/bin/yum -d 0 -e 0 -y install socat
M2Crypto.SSL.SSLError: tlsv1 alert protocol version

Cheers!

[surprisingb]

I don't get how is this related to my changes, am I missing something?

[carabasdaniel]

Hi @surprisingb,

The tests were failing because the branch you are on is ~40 commits behind the current master, but these commits seem to pass on the latest master.
Thank you for your contribution.