[sr-dev] [kamailio/kamailio] hostname in kubernetes (#2119)

[lazedo]

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### Description

gethostname not accurate in kubernetes

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Explain what you did, what you expected to happen, and what actually happened.
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### Troubleshooting

#### Reproduction

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on a recent test with kamailio in kubernetes, found that gethostname can return only the hostname and not the fqdn. this depends on the kind of object is used (deployment/statefulset)


### Possible Solutions

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If you found a solution or workaround for the issue, describe it. Ideally, provide a pull request with a fix.
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the below patch fixed the issues i was having

```
diff --git a/src/modules/ipops/ipops_pv.c b/src/modules/ipops/ipops_pv.c
index 5f77aa9..f65b4dd 100644
--- a/src/modules/ipops/ipops_pv.c
+++ b/src/modules/ipops/ipops_pv.c
@@ -455,6 +455,11 @@
 	if (gethostname(hbuf, 512)<0) {
 		LM_WARN("gethostname failed - host pvs will be null\n");
 		return -1;
+	} else {
+		struct hostent* h;
+		if((h = gethostbyname(hbuf)) != NULL) {
+			memcpy(hbuf, h->h_name, 512);
+		}
 	}
 
 	hlen = strlen(hbuf);

```

### Additional Information

  * **Kamailio Version** - output of `kamailio -v`

```
latest master
```

* **Operating System**:

<!--
Details about the operating system, the type: Linux (e.g.,: Debian 8.4, Ubuntu 16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...;
Kernel details (output of `uname -a`)
-->

```
buster & centos7
```


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