Support custom start-up and clean-up time for VMs (#112)

This pull request implements customizable startup and clean-up time for virtual machine. 
We achieve this by implementing `SimWorkload` chaining and modelling start-up and 
clean-up time using `SimWorkload` as well.

Implements #33

## Implementation Notes :hammer_and_pick:

* Store method parameters in class files
* Add completion parameter to startWorkload
* Provide workload constructors in SimWorkloads 
* Add support for resetting machine context 
* Add support for chaining workloads 
* Use workload chaining for boot delay 
* Model host boot time 
* Do not suspend on guest start 
* Use static logger field 

## Breaking API Changes :warning:

* `SimMachine#startWorkload` now has a third parameter `completion` which is invoked when
   the workload finishes executing (either due to failure or success).
* `SimFlopsWorkload` and `SimRuntimeWorkload` can be instantiated via `SimWorkloads`.

1 files changed, 1 insertions, 1 deletions

diff --git a/opendc-workflow/opendc-workflow-service/src/test/kotlin/org/opendc/workflow/service/WorkflowServiceTest.kt b/opendc-workflow/opendc-workflow-service/src/test/kotlin/org/opendc/workflow/service/WorkflowServiceTest.kt
index c7123000..b165418a 100644
--- a/opendc-workflow/opendc-workflow-service/src/test/kotlin/org/opendc/workflow/service/WorkflowServiceTest.kt
+++ b/opendc-workflow/opendc-workflow-service/src/test/kotlin/org/opendc/workflow/service/WorkflowServiceTest.kt
@@ -119,7 +119,7 @@ internal class WorkflowServiceTest {
                 },
                 { assertEquals(0, metrics.tasksRunning, "Not all started tasks finished") },
                 { assertEquals(metrics.tasksSubmitted, metrics.tasksFinished, "Not all started tasks finished") },
-                { assertEquals(46102707L, clock.millis()) { "Total duration incorrect" } }
+                { assertEquals(45977707L, clock.millis()) { "Total duration incorrect" } }
             )
         }
     }