configs: use proper default IP address for metrics server (#1603)

* configs: use proper default IP address for metrics server

Let's use the IP address assigned to each process by default when
configuring the HTTP Prometheus server. Otherwise having several
processes listening on 0.0.0.0 cause collisions.

* configs: mme.yaml: Fix trailing whitespace

configs/open5gs/amf.yaml.in

@@ -370,5 +370,5 @@ time:
 #      port: 9090
 #
 metrics:
-    addr: 0.0.0.0
+    addr: 127.0.0.5
     port: 9090

configs/open5gs/mme.yaml.in

@@ -248,7 +248,7 @@ mme:
       - addr: 127.0.0.2
     gtpc:
       - addr: 127.0.0.2
-    gummei: 
+    gummei:
       plmn_id:
         mcc: 901
         mnc: 70
@@ -433,5 +433,5 @@ time:
 #      port: 9090
 #
 metrics:
-    addr: 0.0.0.0
-    port: 9090
+    addr: 127.0.0.2
+    port: 9090

configs/open5gs/smf.yaml.in

@@ -575,5 +575,5 @@ time:
 #      port: 9090
 #
 metrics:
-    addr: 0.0.0.0
+    addr: 127.0.0.4
     port: 9090