Fix tmt-try not sourcing plan-env-file after steps

tmt/trying.py

@@ -293,15 +293,15 @@ def action_start_test(self, plan: Plan) -> None:
 
         plan.discover.go()
         plan.provision.go()
-        plan.prepare.go()
-        plan.execute.go()
+        self.action_prepare(plan)
+        self.action_execute(plan)
 
     def action_start_login(self, plan: Plan) -> None:
         """ Start with login """
         self.action_start(plan)
 
         plan.provision.go()
-        plan.prepare.go()
+        self.action_prepare(plan)
         assert plan.login is not None  # Narrow type
         plan.login.go(force=True)
 
@@ -314,7 +314,7 @@ def action_start_ask(self, plan: Plan) -> None:
     def action_test(self, plan: Plan) -> None:
         """ Test again """
         plan.discover.go(force=True)
-        plan.execute.go(force=True)
+        self.action_execute(plan)
 
     def action_login(self, plan: Plan) -> None:
         """ Log into the guest """
@@ -373,10 +373,12 @@ def action_discover(self, plan: Plan) -> None:
     def action_prepare(self, plan: Plan) -> None:
         """ Prepare the guest """
         plan.prepare.go(force=True)
+        plan._source_plan_environment_file()
 
     def action_execute(self, plan: Plan) -> None:
         """ Execute tests """
         plan.execute.go(force=True)
+        plan._source_plan_environment_file()
 
     def action_report(self, plan: Plan) -> None:
         """ Report results """