Added sysconfig support for non-container images

[cachemeoutside]

I noticed that this role utilizes containers and systemd was set up by default. Wanted to add support for sysconfig for non-container images.

[otakup0pe]

I think this is fine, but should it always happen? We don't necessarily want to change the default behavior.

[cachemeoutside]

@otakup0pe I did add a check to see if there was a sysconfig directory. I believe centos/rhel docker container images do not have that set up and this role is expecting supervisord to be configured. If you look at the job log, it'll skip the non-container tasks.

https://travis-ci.org/ANXS/postgresql/jobs/198116075#L1295-L1300