Change some sleep tricks into proper availability checks

tests/webapps-agnostic-supervisord-stateless.nix

@@ -54,8 +54,8 @@ makeTest {
         "${env} nixproc-supervisord-deploy-stateless ${nix-processmgmt}/examples/webapps-agnostic/processes.nix &"
     )
 
+    machine.wait_for_open_port(9001)
     machine.succeed("sleep 30")
-    machine.succeed("cat supervisord.log >&2")
     check_nginx_redirection()
   '';
 }

tests/webapps-agnostic-supervisord.nix

@@ -109,6 +109,7 @@ makeTest {
     machine.succeed(
         "${env} nixproc-systemd-switch ${nix-processmgmt}/tests/processes-supervisord.nix"
     )
+    machine.wait_for_open_port(9001)
 
     # Deploy the system with foreground webapp processes
 

tests/webapps-agnostic-systemd-user.nix

@@ -99,8 +99,7 @@ makeTest {
 
     start_all()
     machine.wait_for_unit("display-manager.service")
-    # Wait a little longer to be sure that the user has logged in
-    machine.succeed("sleep 10")
+    machine.wait_until_succeeds("pgrep -f 'systemd --user'")
 
     # Do an undeploy to force the state to get initialized
     machine.succeed(