Revert "container/test: buffer the close channel"

This reverts commit 7b8a8dba477e6ebdbde157ad32d8bccfef1fe298.
Revert "container/test: fix unix socket test"

This reverts commit 5c4a038d78efbe679e79bdce051b4d8e714bb740.
container/test: sleeping before closing the connection

Trying to fix the build.