Delete collection tarball when no longer needed

* Delete after shipping it
   * Delete when ship() fails

awx/main/analytics/core.py

@@ -119,6 +119,7 @@ def ship(path):
     """
     Ship gathered metrics via the Insights agent
     """
+    try:
         agent = 'insights-client'
         if shutil.which(agent) is None:
             logger.error('could not find {} on PATH'.format(agent))
@@ -140,3 +141,6 @@ def ship(path):
             logger.exception('{} failure:'.format(cmd))
         except subprocess.TimeoutExpired:
             logger.exception('{} timeout:'.format(cmd))
+    finally:
+        # cleanup tar.gz
+        os.remove(path)