output_processors: Move variable initialization to __init__

In the case of a failure in the initialization of one output_processor the
remaining `initialize` methods may not get called causing variables to
not be initialized correctly.

wa/output_processors/cpustates.py

@@ -85,8 +85,9 @@ class CpuStatesProcessor(OutputProcessor):
                   """),
     ]
 
-    def initialize(self, context):
-        self.iteration_reports = OrderedDict()  # pylint: disable=attribute-defined-outside-init
+    def __init__(self, *args, **kwargs):
+        super(CpuStatesProcessor, self).__init__(*args, **kwargs)
+        self.iteration_reports = OrderedDict()
 
     def process_job_output(self, output, target_info, run_output):  # pylint: disable=unused-argument
         trace_file = output.get_artifact_path('trace-cmd-txt')

wa/output_processors/csvproc.py

@@ -49,6 +49,11 @@ class CsvReportProcessor(OutputProcessor):
                   """),
     ]
 
+    def __init__(self, *args, **kwargs):
+        super(CsvReportProcessor, self).__init__(*args, **kwargs)
+        self.outputs_so_far = []
+        self.artifact_added = False
+
     def validate(self):
         super(CsvReportProcessor, self).validate()
         if self.use_all_classifiers and self.extra_columns:
@@ -56,11 +61,6 @@ class CsvReportProcessor(OutputProcessor):
                   'use_all_classifiers is True'
             raise ConfigError(msg)
 
-    def initialize(self, context):
-        # pylint: disable=attribute-defined-outside-init
-        self.outputs_so_far = []
-        self.artifact_added = False
-
     # pylint: disable=unused-argument
     def process_job_output(self, output, target_info, run_output):
         self.outputs_so_far.append(output)

wa/output_processors/sqlite.py

@@ -108,7 +108,8 @@ class SqliteResultProcessor(OutputProcessor):
 
     ]
 
-    def initialize(self, context):
+    def __init__(self, *args, **kwargs):
+        super(SqliteResultProcessor, self).__init__(*args, **kwargs)
         self._last_spec = None
         self._run_oid = None
         self._spec_oid = None