* chore: add DirectPath fallback integration test

* feat: attemp DirectPath by default

* feat: attemp DirectPath by default

Committer: @miraleung
PiperOrigin-RevId: 350067652

Source-Author: Google APIs <[email protected]>
Source-Date: Mon Jan 4 19:45:21 2021 -0800
Source-Repo: googleapis/googleapis
Source-Sha: ad3bb00ed7750cd0625b3a36e0e2eff29f778e4a
Source-Link: googleapis/googleapis@ad3bb00

…to v3.2.1 (#771)

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<details><summary>Log from Synthtool</summary>

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2021-01-07 00:26:29,474 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-spanner/.github/readme/synth.py.
On branch autosynth-readme
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* chore: add DirectPath fallback integration test

* fix: Set up DirectPath e2e tests correctly

This PR was generated using Autosynth. 🌈


<details><summary>Log from Synthtool</summary>

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2021-01-07 05:06:13,296 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-spanner/.github/readme/synth.py.
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…2.1 (#782)

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This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:libraries-bom](https://togithub.com/GoogleCloudPlatform/cloud-opensource-java) | patch | `16.2.0` -> `16.2.1` |

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<details><summary>Log from Synthtool</summary>

```
2021-01-07 21:33:13,706 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-spanner/.github/readme/synth.py.
On branch autosynth-readme
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