remove console message on close operation

[milyin]

Close operation outputs the message about disconnection:

Test: src/z_api_pub_sub.ts
Test function: putSubTest
Websocket connection to remote-api-plugin has been disconnected
Websocket connection to remote-api-plugin has been disconnected
Test: src/z_api_queryable_get.ts
Test function: queryableSessionGetCallbackTest
Test function: queryableSessionGetChannelTest
Websocket connection to remote-api-plugin has been disconnected
...

This makes user think that something is wrong, while it's totally ok to disconnect from server on close operation