chore: migrate to owlbot (#724)

.github/.OwlBot.lock.yaml

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+docker:
+  digest: sha256:ee698481139bf3df35cd83d2f17f9670ee914d6184f8909a81d672a6abaf0e72
+  image: gcr.io/repo-automation-bots/owlbot-java:latest

.github/.OwlBot.yaml

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+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+docker:
+  image: "gcr.io/repo-automation-bots/owlbot-java:latest"
+
+deep-remove-regex:
+- "/grpc-google-.*/src"
+- "/proto-google-.*/src"
+- "/google-.*/src"
+
+deep-copy-regex:
+- source: "/google/cloud/asset/(v.*)/.*-java/proto-google-.*/src"
+  dest: "/owl-bot-staging/$1/proto-google-cloud-asset-$1/src"
+- source: "/google/cloud/asset/(v.*)/.*-java/grpc-google-.*/src"
+  dest: "/owl-bot-staging/$1/grpc-google-cloud-asset-$1/src"
+- source: "/google/cloud/asset/(v.*)/.*-java/gapic-google-.*/src"
+  dest: "/owl-bot-staging/$1/google-cloud-asset/src"

owlbot.py

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+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import synthtool as s
+from synthtool.languages import java
+
+
+for library in s.get_staging_dirs():
+    # put any special-case replacements here
+    s.move(library)
+
+s.remove_staging_dirs()
+java.common_templates()