chore(test): Wait for server to shut down before running new tests

A test in 21d1190 failed because the server from a previous test was already running

Author: gnarea

src/test/kotlin/tech/relaycorp/relaynet/cogrpc/test/TestCogRPCServer.kt

@@ -5,6 +5,7 @@ import io.grpc.Server
 import io.grpc.netty.NettyServerBuilder
 import java.net.InetSocketAddress
 import java.util.concurrent.TimeUnit
+import java.util.logging.Logger
 
 class TestCogRPCServer(
     private val host: String,
@@ -13,6 +14,8 @@ class TestCogRPCServer(
 ) {
     private var server: Server? = null
 
+    private val logger = Logger.getLogger(TestCogRPCServer::class.java.name)
+
     fun start() {
         server = NettyServerBuilder
             .forAddress(InetSocketAddress(host, port))
@@ -23,7 +26,9 @@ class TestCogRPCServer(
 
     fun stop() {
         if (server?.shutdown()?.awaitTermination(3, TimeUnit.SECONDS) == false) {
+            logger.info("Forcing test server to shut down")
             server?.shutdownNow()
+            server?.awaitTermination()
         }
         server = null
     }