Concurrent map writes in legacy tests

[IzabellaRaulin]

From time to time snap legacy tests (go1.8.1 and 1.7.3) fail because of concurrent map writes happen.

Feel free to add under this issue screenshot when you observe it again.

[ami-GS]

Hi @IzabellaRaulin

I could reproduce same issue on PR of 1741
The output is in travis CI of here

and sometimes below command could reproduce the issue as well both original and my modified Dockerfile.
./run_tests_with_docker.sh legacy
My commit might not affect legacy test...

[donzh]

Hi @ami-GS

I checked the error message you provided.
I didn't find any error message which is related with concurrent map writes.
It seems that the first error is related with "Can't import ...".
Actually I'm a snap beginner. Could you please tell me why do you think your issue is related with "concurrent map writes". Many thanks!

[ami-GS]

Hi @donzh

I checked as well, the log seems changed...strange....
Travis CI retry test? I'm a Travis CI beginner...

Sorry for confusing you, but the log was exactly "concurrent map writes" at first.
and "Can't import ..." was also reported different PR. pleas refer different logs