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

Iniziate dalle voci dello stack trace AndroidTestOrchestrator.execShellCommandSync e ShellCommandClient.execOnServerSync, quindi confrontate le esecuzioni di Firebase Test Lab su emulatori Nexus 5X che usano le API 23 e 24. Riproducete il fallimento intermittente, se possibile, e determinate se tali esecuzioni vengono completate senza ClientNotConnected; l'issue non fornisce passaggi riproducibili né un test denominato.

Scritto dal modello di indicizzazione a partire dal testo della issue.