refactor(logging): improve logging for AbstractWaitForClusterWideClou…

…ddriverTask

Add specificity to the log message so you can tell which task is actually waiting for something to happen.
So.. instead of:
```
Pipeline 01D9QSYBNK7ENG0BSM7V9V07ZZ is looking for [us-east-1->serverlabmvulfson-dev-v044]
Server groups matching AbstractWaitForClusterWideClouddriverTask$DeployServerGroup(region:us-east-1, name:serverlabmvulfson-dev-v044) ...
```
we will have:
```
Pipeline 01D9R3HMZHZ82H0RNKG1D8JBRW:WaitForClusterDisableTask looking for server groups: [us-east-1->serverlabmvulfson-dev-v047] found: [[instances...
```

orca-clouddriver/src/main/groovy/com/netflix/spinnaker/orca/clouddriver/tasks/cluster/AbstractWaitForClusterWideClouddriverTask.groovy

@@ -68,7 +68,8 @@ abstract class AbstractWaitForClusterWideClouddriverTask extends AbstractCloudPr
       def isMatch = it.region == deployServerGroup.region && it.name == deployServerGroup.name
       isMatch
     })
-    log.info "Server groups matching $deployServerGroup : $matchingServerGroups"
+
+    log.info("${this.getClass().getSimpleName()}: Server groups matching $deployServerGroup : $matchingServerGroups")
     isServerGroupOperationInProgress(stage, interestingHealthProviderNames, matchingServerGroups)
   }
 
@@ -81,6 +82,11 @@ abstract class AbstractWaitForClusterWideClouddriverTask extends AbstractCloudPr
   static class DeployServerGroup {
     String region
     String name
+
+    @Override
+    String toString() {
+      return "${region}->${name}"
+    }
   }
 
   static class RemainingDeployServerGroups {
@@ -110,8 +116,7 @@ abstract class AbstractWaitForClusterWideClouddriverTask extends AbstractCloudPr
     }
 
     def serverGroups = cluster.get().serverGroups.collect { new TargetServerGroup(it) }
-    log.info "Pipeline ${stage.execution?.id} found server groups ${serverGroups.collect { it.region + "->" + it.name }}"
-    log.info "Pipeline ${stage.execution?.id} is looking for ${remainingDeployServerGroups.collect { it.region + "->" + it.name }}"
+    log.info "Pipeline ${stage.execution?.id}:${this.getClass().getSimpleName()} looking for server groups: $remainingDeployServerGroups found: $serverGroups"
 
     if (!serverGroups) {
       return emptyClusterResult(stage, clusterSelection, cluster.get())
@@ -121,11 +126,11 @@ abstract class AbstractWaitForClusterWideClouddriverTask extends AbstractCloudPr
     List<DeployServerGroup> stillRemaining = remainingDeployServerGroups.findAll(this.&isServerGroupOperationInProgress.curry(stage, serverGroups, healthProviderTypesToCheck))
 
     if (stillRemaining) {
-      log.info "Pipeline ${stage.execution?.id} still has ${stillRemaining.collect { it.region + "->" + it.name }}"
+      log.info "Pipeline ${stage.execution?.id}:${this.getClass().getSimpleName()} still has $stillRemaining"
       return TaskResult.builder(ExecutionStatus.RUNNING).context([remainingDeployServerGroups: stillRemaining]).build()
     }
 
-    log.info "Pipeline ${stage.execution?.id} no server groups remain"
+    log.info "Pipeline ${stage.execution?.id}:${this.getClass().getSimpleName()} no server groups remain"
     return TaskResult.SUCCEEDED
   }
 }