Fixed EADDRINUSE error

The error inside the cms-client did not stop in all cases a the cmake server
instance. This had the problem that a cmake instance was running and the
named pipe can not be used because it was used by the old cmake instance.
This modification stops the client, so that the cmake server / the named
pipe ends.

src/cms-client.ts

@@ -665,6 +665,7 @@ export class CMakeServerClient {
             resolved = true;
             resolve(client);
           } catch (e) {
+            await client.shutdown();
             resolved = true;
             reject(e);
           }