fixes bigtable path (GoogleCloudPlatform#897)

Author: bshaffer

testing/run_test_suite.sh

@@ -43,7 +43,7 @@ ALT_PROJECT_TESTS=(
     bigquery/quickstart
     datastore/api
     datastore/tutorial
-    bigtable/api
+    bigtable
     dialogflow
     dlp
     error_reporting