Add test format versioning to storage benchmarks

Adds a test_format database column and a value in the API return for the
test format version, starting at 0 for the existing format as of 0.9.37.

References #143

api-daemon/pvcapid/benchmark.py

@@ -95,6 +95,7 @@ def list_benchmarks(job=None):
         benchmark_data = dict()
         benchmark_data['id'] = benchmark['id']
         benchmark_data['job'] = benchmark['job']
+        benchmark_data['test_format'] = benchmark['test_format']
         benchmark_data['benchmark_result'] = loads(benchmark['result'])
         # Append the new data to our actual output structure
         data.append(benchmark_data)
@@ -111,6 +112,9 @@ def run_benchmark(self, pool):
     import json
     from datetime import datetime
 
+    # Define the current test format
+    TEST_FORMAT = 0
+
     time.sleep(2)
 
     # Phase 0 - connect to databases
@@ -135,8 +139,8 @@ def run_benchmark(self, pool):
 
     print("Storing running status for job '{}' in database".format(job_name))
     try:
-        query = "INSERT INTO storage_benchmarks (job, result) VALUES (%s, %s);"
-        args = (job_name, "Running",)
+        query = "INSERT INTO storage_benchmarks (job, test_format, result) VALUES (%s, %s);"
+        args = (job_name, TEST_FORMAT, "Running",)
         db_cur.execute(query, args)
         db_conn.commit()
     except Exception as e: