honour explicitPeer param in tunnels

libi2pd_client/ClientContext.cpp

@@ -459,6 +459,8 @@ namespace client
 			else if (authType == "2") // PSK
 				ReadI2CPOptionsGroup (section, I2CP_PARAM_LEASESET_CLIENT_PSK, options);
 		}
+		std::string explicitPeers = GetI2CPStringOption(section, I2CP_PARAM_EXPLICIT_PEERS, "");
+		if (explicitPeers.length () > 0) options[I2CP_PARAM_EXPLICIT_PEERS] = explicitPeers;
 	}
 
 	void ClientContext::ReadI2CPOptionsFromConfig (const std::string& prefix, std::map<std::string, std::string>& options) const