Agent/improvements (#779)

* job step type and error message details change

* added newline for both environments

* checked for inner exceptions

* sorted imports

* added ability to change job owner

src/Microsoft.SqlTools.ServiceLayer/Agent/Jobs/JobProperties.cs

@@ -218,5 +218,10 @@ namespace Microsoft.SqlTools.ServiceLayer.Agent
         {
             get { return (JobCompletionActionCondition)this.eventLogLevel; }
         }
+
+        public string Owner 
+        {
+            get { return this.owner; }
+        }
     }
 }