netstack3-tests fail with error `Failed to retrieve endpoint`

[Y Matsuda]

Hi team,

Some `netstack3-tests` tests fail with the same errors below:

```

thread 'main' panicked at 'Test Setup succeeds: Failed to retrieve endpoint alice', ../../src/connectivity/network/netstack3/src/bindings/icmp/provider.rs:399:14

```

(endpoint name and line number depend on each tasts)

EndpointManager seems to return None when its get_endpoint() called.

https://fuchsia.googlesource.com/fuchsia/+/refs/heads/main/src/connectivity/network/netstack3/src/bindings/integration_tests.rs#421

Logs:

 - stdout: https://drive.google.com/file/d/1m_8e2zdW8ZCKKVJ5YlQyu8Z8jTdTgWgb/view?usp=sharing

 - fidlcat(fx fidlcat --remote-name=netstack3-bin-test.cmx): https://drive.google.com/file/d/1iHHnHZMWJ1YfMofhmBTtZJU2PzD30lsn/view?usp=sharing

Steps to reproduce:

```

[shell-A]

$ fx set core.qemu-x64 --with //src/connectivity/network/netstack3:netstack3 --with //src/connectivity/network/netstack3:netstack3-tests --ccache

$ fx build

$ sudo ip tuntap add dev qemu mode tap user $USER

$ sudo ip link set qemu up

$ fx qemu -N

[00008.277] 19147:19149> mDNS: Using unique host name fuchsia-5254-0063-5e7a.local.

[shell-B]

$ fx set-device fuchsia-5254-0063-5e7a

$ fx serve

[shell-C]

$ fx test netstack3-tests

```

What I tried:

```

$ sudo ip tuntap add dev qemu-extra mode tap user $USER

$ sudo ip link set qemu-extra up

$ fx qemu -kN -- -nic tap,ifname=qemu-extra,model=e1000

$ fx set-device fuchsia-5254-0012-3456

$ fx test netstack3-tests

[same errors]

```

Environment:

```

$ uname -a

Linux ymatsuda-dpc 5.8.0-53-generic #60~20.04.1-Ubuntu SMP Thu May 6 09:52:46 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

$ cat /etc/os-release

NAME="Ubuntu"

VERSION="20.04.2 LTS (Focal Fossa)"

ID=ubuntu

ID_LIKE=debian

PRETTY_NAME="Ubuntu 20.04.2 LTS"

VERSION_ID="20.04"

VERSION_CODENAME=focal

$ git status

HEAD detached at f76e1188bd3

nothing to commit, working tree clean

```

Something missing settings or packages?

thank you for your support,

ymatsuda

[Y Matsuda]

Oh sorry, I solved it myself.

It seems that the testing modules was just missing, and it worked fine by the following commands:

```

$ fx set core.qemu-x64 --with //src/connectivity:connectivity --ccache

```

2021年5月14日金曜日 9:42:04 UTC+9 Y Matsuda:

[Joshua Liebow-Feeser]

Hi ymatsuda,

Thanks for your report, and glad you were able to figure out the issue! You shouldn't have run into this problem, so I'll consider this a bug report and we'll look into making it so that other folks don't run into this issue in the future 🙂

Cheers,

Josh

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