cloudstack-setup-databases: get local address instead of 127.0.1.1

In some linux setup, the server has the line in /etc/hosts
```
127.0.1.1   <hostname>
```

If the mgmt serve IP is not specified when run cloudstack-setup-databases, ACS detects the host ip in python, however there is an issue with it.
```
>>> import socket
>>> socket.gethostbyname(socket.gethostname())
'127.0.1.1'     <<<<=======================this is not good
>>> socket.gethostbyname(socket.gethostname() + ".local")
'10.0.100.100'  <<<========================this is good
```

Author: weizhouapache

setup/bindir/cloud-setup-databases.in

@@ -328,7 +328,7 @@ for example:
     def grabSystemInfo(self):
         def getIpAddr():
             try:
-                ip = socket.gethostbyname(socket.gethostname())
+                ip = socket.gethostbyname(socket.gethostname() + ".local")
                 return ip
             except Exception as e:
                 return "127.0.0.1"