Sync peers FQDN (#584)

Use stdout and stderr log path only if on Linux and attempt to create the path

Update status system with FQDN fields and 
status command to display the domain names of remote and local peers

Set some DNS logs to tracing

update readme file

management/proto/management.proto

@@ -158,6 +158,8 @@ message PeerConfig {
 
   // SSHConfig of the peer.
   SSHConfig sshConfig = 3;
+  // Peer fully qualified domain name
+  string fqdn = 4;
 }
 
 // NetworkMap represents a network state of the peer with the corresponding configuration parameters to establish peer-to-peer connections
@@ -196,6 +198,9 @@ message RemotePeerConfig {
   // SSHConfig is a SSH config of the remote peer. SSHConfig.sshPubKey should be ignored because peer knows it's SSH key.
   SSHConfig sshConfig = 3;
 
+  // Peer fully qualified domain name
+  string fqdn = 4;
+
 }
 
 // SSHConfig represents SSH configurations of a peer.