Cleanup bigtable python examples [(#2692)](GoogleCloudPlatform/python-docs-samples#2692)

* Cleanup bigtable python:
Use new row types for mutations
Update bigtable version in requirements
Delete table after tests

* Change bigtable cluster variable to bigtable instance for consistency
Create and delete quickstart table during test

* Fixing step size for metric scaler
Create unique tables for quickstart tests

* Creating fixtures for quickstart tests
Fixing hb quickstart test output

* Fix quickstart extra delete table
Update happybase to use direct row

* Use clearer instance names for tests
Create unique instances for metric scaler tests

* Linting

* remove core dep

Co-authored-by: Leah E. Cole <[email protected]>

Author: billyjacobson

samples/hello/main.py

@@ -75,7 +75,7 @@ def main(project_id, instance_id, table_id):
         #
         #     https://cloud.google.com/bigtable/docs/schema-design
         row_key = 'greeting{}'.format(i).encode()
-        row = table.row(row_key)
+        row = table.direct_row(row_key)
         row.set_cell(column_family_id,
                      column,
                      value,

samples/hello/main_test.py

@@ -18,16 +18,16 @@
 from main import main
 
 PROJECT = os.environ['GCLOUD_PROJECT']
-BIGTABLE_CLUSTER = os.environ['BIGTABLE_CLUSTER']
-TABLE_NAME_FORMAT = 'hello-bigtable-system-tests-{}'
+BIGTABLE_INSTANCE = os.environ['BIGTABLE_INSTANCE']
+TABLE_NAME_FORMAT = 'hello-world-test-{}'
 TABLE_NAME_RANGE = 10000
 
 
 def test_main(capsys):
     table_name = TABLE_NAME_FORMAT.format(
         random.randrange(TABLE_NAME_RANGE))
 
-    main(PROJECT, BIGTABLE_CLUSTER, table_name)
+    main(PROJECT, BIGTABLE_INSTANCE, table_name)
 
     out, _ = capsys.readouterr()
     assert 'Creating the {} table.'.format(table_name) in out

samples/hello/requirements.txt

@@ -1,2 +1,2 @@
-google-cloud-bigtable==1.2.0
+google-cloud-bigtable==1.2.1
 google-cloud-core==1.1.0