update other copyright comments for redpanda

Author: andrewhsu

tests/rptest/services/verifiable_consumer.py

@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-# Modifications copyright (C) 2021 Vectorized
+# Modifications Copyright 2021 Redpanda Data, Inc.
 # - Reformatted code
 # - Replaced dependency on Kafka with Redpanda
 

tests/rptest/services/verifiable_producer.py

@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-# Modifications copyright (C) 2021 Vectorized
+# Modifications Copyright 2021 Redpanda Data, Inc.
 # - Reformatted code
 # - Replaced dependency on Kafka with Redpanda
 # - Imported a is_int_* helper functions from ducktape test suite

tests/rptest/tests/end_to_end.py

@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-# Modifications copyright (C) 2021 Vectorized
+# Modifications Copyright 2021 Redpanda Data, Inc.
 # - Reformatted code
 # - Replaced dependency on Kafka with Redpanda
 # - Imported annotate_missing_msgs helper from kafka test suite

tools/redpanda-gdb.py

@@ -15,7 +15,7 @@
 # along with Scylla.  If not, see <http://www.gnu.org/licenses/>.
 #
 #   - Copyright (C) 2015 ScyllaDB
-#   - 2020 Vectorized - libc++ support and redpanda types
+#   - Copyright 2020 Redpanda Data, Inc. - libc++ support and redpanda types
 #
 # -----
 #