Possibility to set custom RTMP/RTMPS hostname (#4811)

* live: set custom RTMP/RTMPS hostname

closes #4786

* dont use webserver.hostname as default

* check that rtmp/s.hostname is set

config/default.yaml

@@ -396,6 +396,7 @@ live:
   rtmp:
     enabled: true
     port: 1935
+    hostname: 'localhost'
 
   rtmps:
     enabled: false
@@ -404,6 +405,7 @@ live:
     key_file: ''
     # Absolute path
     cert_file: ''
+    hostname: 'localhost'
 
   # Allow to transcode the live streaming in multiple live resolutions
   transcoding:

config/production.yaml.example

@@ -404,6 +404,7 @@ live:
   rtmp:
     enabled: true
     port: 1935
+    hostname: 'localhost'
 
   rtmps:
     enabled: false
@@ -412,6 +413,7 @@ live:
     key_file: ''
     # Absolute path
     cert_file: ''
+    hostname: 'localhost'
 
   # Allow to transcode the live streaming in multiple live resolutions
   transcoding: