fw/execution: fix Exception on abort

Hitting CTRL-C will abort execution of the current job, but will still
trigger run finalization, and possibly, post-processing and teardown of
the current job. If an exception is raised during this
post-process/teardown, the previous exception state (for the
KeybardInterrupt) will be clobbered. That means that, after the new
exception has been handled, WA would attempt to execute the next job,
rather than go to finalization of the run.

To avoid this, set a flag in the context upon catching KeybardInterrupt,
and check this flag before attempting to execute the next job in the
queue.

wa/framework/execution.py

@@ -98,6 +98,7 @@ class ExecutionContext(object):
         self.current_job = None
         self.successful_jobs = 0
         self.failed_jobs = 0
+        self.run_interrupted = False
 
     def start_run(self):
         self.output.info.start_time = datetime.utcnow()
@@ -372,6 +373,8 @@ class Runner(object):
             self.send(signal.RUN_INITIALIZED)
 
             while self.context.job_queue:
+                if self.context.run_interrupted:
+                    raise KeyboardInterrupt()
                 with signal.wrap('JOB_EXECUTION', self, self.context):
                     self.run_next_job(self.context)
 
@@ -425,6 +428,7 @@ class Runner(object):
         except (Exception, KeyboardInterrupt) as e: # pylint: disable=broad-except
             log.log_error(e, self.logger)
             if isinstance(e, KeyboardInterrupt):
+                context.run_interrupted = True
                 job.set_status(Status.ABORTED)
                 raise e
             else:
@@ -467,6 +471,7 @@ class Runner(object):
                 with signal.wrap('JOB_EXECUTION', self, context):
                     job.run(context)
             except KeyboardInterrupt:
+                context.run_interrupted = True
                 job.set_status(Status.ABORTED)
                 raise
             except Exception as e:
@@ -488,6 +493,7 @@ class Runner(object):
                     raise
 
         except KeyboardInterrupt:
+            context.run_interrupted = True
             job.set_status(Status.ABORTED)
             raise
         finally:
@@ -512,7 +518,10 @@ class Runner(object):
                 self.context.failed_jobs += 1
         else:  # status not in retry_on_status
             self.logger.info('Job completed with status {}'.format(job.status))
-            self.context.successful_jobs += 1
+            if job.status != 'ABORTED':
+                self.context.successful_jobs += 1
+            else:
+                self.context.failed_jobs += 1
 
     def retry_job(self, job):
         retry_job = Job(job.spec, job.iteration, self.context)