Fedora support

Fedora operating system is not currently not supported because it uses a different upstream package repository than RedHat.

Structure of RedHat upstream repository
```
base_url=http://yum.postgresql.org/9.5/redhat/rhel-7-x86_64/
```
vs
```
base_url=https://download.postgresql.org/pub/repos/yum/9.6/fedora/fedora-24-x86_64/
```


