##### SUMMARY
If a host has port set to a usermacro, the host is created successfully. On the next run, the update fails with `ValueError: invalid literal for int() with base 10: {$MACRO}`.

Tested with the latest `zabbix_host` from git.

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
zabbix_host

##### ANSIBLE VERSION
latest

##### CONFIGURATION
Not relevant.

##### OS / ENVIRONMENT
Not relevant.

##### STEPS TO REPRODUCE
Have a host definition with usermacro used for port in an interface. Create the host via Ansible, then run the playbook again.

##### EXPECTED RESULTS
Success (reported as no change).

##### ACTUAL RESULTS

```paste below
Traceback (most recent call last):
  File \"/home/ansible/.ansible/tmp/ansible-tmp-1571042967.61-236562069605480/AnsiballZ_zabbix_host.py\", line 114, in <module>
    _ansiballz_main()
  File \"/home/ansible/.ansible/tmp/ansible-tmp-1571042967.61-236562069605480/AnsiballZ_zabbix_host.py\", line 106, in _ansiballz_main
    invoke_module(zipped_mod, temp_path, ANSIBALLZ_PARAMS)
  File \"/home/ansible/.ansible/tmp/ansible-tmp-1571042967.61-236562069605480/AnsiballZ_zabbix_host.py\", line 49, in invoke_module
    imp.load_module(__main__, mod, module, MOD_DESC)
  File \"/tmp/ansible_zabbix_host_payload_7ml4r2/__main__.py\", line 857, in <module>
  File \"/tmp/ansible_zabbix_host_payload_7ml4r2/__main__.py\", line 817, in main
  File \"/tmp/ansible_zabbix_host_payload_7ml4r2/__main__.py\", line 479, in check_all_properties
  File \"/tmp/ansible_zabbix_host_payload_7ml4r2/__main__.py\", line 437, in check_interface_properties
ValueError: invalid literal for int() with base 10: {$MACRO}
```

ip = interface['ip']
    
    if proxy:
        proxy_id = host.get_proxyid_by_proxy_name(proxy)
    else:
        proxy_id = 0
    
    is_host_exist = host.is_host_exist(host_name)
    if is_host_exist:
        
        zabbix_host_obj = host.get_host_by_host_name(host_name)
        host_id = zabbix_host_obj['hostid']
        
        if proxy is None:
            proxy_id = int(zabbix_host_obj['proxy_hostid'])
        if state == "absent":
            
            host.delete_host(host_id, host_name)
            module.exit_json(changed=True, result="Successfully delete host %s" % host_name)
        else:
            if not host_groups:
                
                
                host_groups = host.get_host_groups_by_host_id(host_id)
                group_ids = host.get_group_ids_by_group_names(host_groups)
            
            exist_interfaces = host._zapi.hostinterface.get({'output': 'extend', 'hostids': host_id})
            
            if not interfaces:
                interfaces = []