[ws-daemon] Close grpc server and daemon socket

[aledbf]

How to test:

• Start a workspace.
• Check in what node is running using kubectl get pods -o wide
• Run kubectl port-forward <ws-daemon in same node> 6060
• Open http://localhost:6060/debug/pprof/goroutine

The output should contain

1 @ 0x43aec5 0x43351b 0x46c1f5 0x4e5965 0x4e87d2 0x4e87b4 0x573085 0x594992 0x593025 0x94f57f 0x1274de5 0x471e61
#	0x46c1f4	internal/poll.runtime_pollWait+0x54								/home/gitpod/sdk/go1.16/src/runtime/netpoll.go:222
#	0x4e5964	internal/poll.(*pollDesc).wait+0x44								/home/gitpod/sdk/go1.16/src/internal/poll/fd_poll_runtime.go:87
#	0x4e87d1	internal/poll.(*pollDesc).waitRead+0x211							/home/gitpod/sdk/go1.16/src/internal/poll/fd_poll_runtime.go:92
#	0x4e87b3	internal/poll.(*FD).Accept+0x1f3								/home/gitpod/sdk/go1.16/src/internal/poll/fd_unix.go:401
#	0x573084	net.(*netFD).accept+0x44									/home/gitpod/sdk/go1.16/src/net/fd_unix.go:172
#	0x594991	net.(*UnixListener).accept+0x31									/home/gitpod/sdk/go1.16/src/net/unixsock_posix.go:162
#	0x593024	net.(*UnixListener).Accept+0x64									/home/gitpod/sdk/go1.16/src/net/unixsock.go:260
#	0x94f57e	google.golang.org/grpc.(*Server).Serve+0x27e							/workspace/go/pkg/mod/google.golang.org/[email protected]/server.go:739
#	0x1274de4	github.com/gitpod-io/gitpod/ws-daemon/pkg/iws.(*InWorkspaceServiceServer).Start.func1+0x64	/tmp/build/components-ws-daemon--app.1288025c7c291992e5141266b8ebcdd45111fc45/pkg/iws/iws.go:172

• Stop the workspace.
• After that, refresh http://localhost:6060/debug/pprof/goroutine
• Search for iws.go:172. It should not be found and the number of goroutines should be lower.

fixes #3108

[aledbf]

This assert was incorrect.

[meysholdt]

tried it, works as advertised, thank you!