Fixing job id parameter, fixes #393 (#394)

Change-Id: I04633599e3b76143b04028defa9668cbc2802ba1

Author: Jon Wayne Parrott

bigquery/api/async_query.py

@@ -33,12 +33,12 @@
 
 # [START async_query]
 def async_query(bigquery, project_id, query, batch=False, num_retries=5):
-    # Generate a unique job_id so retries
+    # Generate a unique job ID so retries
     # don't accidentally duplicate query
     job_data = {
         'jobReference': {
             'projectId': project_id,
-            'job_id': str(uuid.uuid4())
+            'jobId': str(uuid.uuid4())
         },
         'configuration': {
             'query': {

bigquery/api/export_data_to_cloud_storage.py

@@ -54,7 +54,7 @@ def export_table(bigquery, cloud_storage_path,
     Returns: an extract job resource representing the
         job, see https://cloud.google.com/bigquery/docs/reference/v2/jobs
     """
-    # Generate a unique job_id so retries
+    # Generate a unique job ID so retries
     # don't accidentally duplicate export
     job_data = {
         'jobReference': {

bigquery/api/load_data_from_csv.py

@@ -50,12 +50,12 @@ def load_table(bigquery, project_id, dataset_id, table_name, source_schema,
     https://cloud.google.com/bigquery/docs/reference/v2/jobs#configuration.load
     """
 
-    # Generate a unique job_id so retries
+    # Generate a unique job ID so retries
     # don't accidentally duplicate query
     job_data = {
         'jobReference': {
             'projectId': project_id,
-            'job_id': str(uuid.uuid4())
+            'jobId': str(uuid.uuid4())
         },
         'configuration': {
             'load': {