Add Cloudlinux support for hostname.py

**SUMMARY**

Add Cloudlinux 6 and Cloudlinux 7 support

**ISSUE TYPE**

Feature Pull Request

**COMPONENT NAME**

lib/ansible/modules/system/hostname.py

**ANSIBLE VERSION**
```
2.4
```

lib/ansible/modules/system/hostname.py

@@ -647,6 +647,16 @@ class CentOSLinuxHostname(Hostname):
     distribution = 'Centos linux'
     strategy_class = RedHatStrategy
 
+class CloudlinuxHostname(Hostname):
+    platform = 'Linux'
+    distribution = 'Cloudlinux'
+    strategy_class = RedHatStrategy
+
+class CloudlinuxServerHostname(Hostname):
+    platform = 'Linux'
+    distribution = 'Cloudlinux server'
+    strategy_class = RedHatStrategy
+
 class ScientificHostname(Hostname):
     platform = 'Linux'
     distribution = 'Scientific'