Move file management logic to per worload run

Move file management steps to initialize and finalize methods instead of
setup and teardown. These steps should be performed per run instead of
per iteration. Affected workloads: gmail, googlephotos.

wlauto/workloads/googlephotos/__init__.py

@@ -58,8 +58,8 @@ class Googlephotos(AndroidUiAutoBenchmark):
         self.uiauto_params['output_file'] = self.output_file
         self.uiauto_params['dumpsys_enabled'] = self.dumpsys_enabled
 
-    def setup(self, context):
-        super(Googlephotos, self).setup(context)
+    def initialize(self, context):
+        super(Googlephotos, self).initialize(context)
 
         for entry in os.listdir(self.dependencies_directory):
             wa_file = ''.join([self.file_prefix, entry])
@@ -96,6 +96,10 @@ class Googlephotos(AndroidUiAutoBenchmark):
                                       context.output_directory)
                 self.device.delete_file(os.path.join(self.device.working_directory, entry))
 
+    def finalize(self, context):
+        super(Googlephotos, self).finalize(context)
+
+        for entry in self.device.listdir(self.device.working_directory):
             if entry.startswith(self.file_prefix) and entry.endswith(".jpg"):
                 self.device.delete_file(os.path.join(self.device.working_directory, entry))