java.lang.RuntimeException: androidx.test.services.shellexecutor.ClientNotConnected

### Description

Instrumentation test randomly failing. When running espresso tests on our CI machine (which runs tests on Firebase Test Lab) we occasionally get the following crash and then the tests stop:

```
FATAL EXCEPTION: AndroidTestOrchestrator
Process: androidx.test.orchestrator, PID: 8463
java.lang.RuntimeException: androidx.test.services.shellexecutor.ClientNotConnected
at androidx.test.services.shellexecutor.ShellExecutorImpl.executeShellCommandSync(ShellExecutorImpl.java:60)
at androidx.test.orchestrator.AndroidTestOrchestrator.execShellCommandSync(AndroidTestOrchestrator.java:532)
at androidx.test.orchestrator.AndroidTestOrchestrator.access$700(AndroidTestOrchestrator.java:127)
at androidx.test.orchestrator.AndroidTestOrchestrator$2.run(AndroidTestOrchestrator.java:360)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)
Caused by: androidx.test.services.shellexecutor.ClientNotConnected
at androidx.test.services.shellexecutor.ShellCommandClient.execOnServer(ShellCommandClient.java:97)
at androidx.test.services.shellexecutor.ShellCommandClient.execOnServerSync(ShellCommandClient.java:135)
at androidx.test.services.shellexecutor.ShellExecutorImpl.executeShellCommandSync(ShellExecutorImpl.java:56)
... 6 more
```

It's never the same test causing the problem. Not sure it matters but it's only when testing on Nexus5X emulator for API versions 23 / 24. Tests on other emulators / API versions all pass fine.

### Steps to Reproduce

none

### Expected Results

Tests should continue and complete

### Actual Results

Crash.

### AndroidX Test and Android OS Versions

junitVersion = '4.12'
androidXJunitVersion = '1.1.1-alpha01'
androidXTestRunnerVersion = '1.1.2-alpha01'
androidXTestRulesVersion = '1.1.2-alpha01'
androidXTestOrchestratorVersion = '1.1.2-alpha01'
espressoCoreVersion = '3.1.2-alpha01'
espressoContribVersion = '3.1.2-alpha01'
espressoIdlingVersion = '3.1.2-alpha01'

### Link to a public git repo demonstrating the problem:

none

Beginnen Sie mit den Stacktrace-Einträgen AndroidTestOrchestrator.execShellCommandSync und ShellCommandClient.execOnServerSync und vergleichen Sie anschließend Firebase Test Lab-Ausführungen auf Nexus 5X-Emulatoren mit API 23 und 24. Reproduzieren Sie den intermittierenden Fehler, falls möglich, und stellen Sie fest, ob diese Ausführungen ohne ClientNotConnected abgeschlossen werden; der Issue enthält keine reproduzierbaren Schritte oder einen benannten Test.

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