Docker login command accesses random KeyChain entries and fails

Duplicated from https://github.com/docker/for-mac/issues/1540 Adding here to hopefully get more visibility.

Expected behavior:
Running the command
docker login -u USER -p PASS HOST:8443
should login to the specified repo.

Unexpected behavior:
Running the above command causes docker to ask to access the KeyChain for a randomly chosen entry.
If I deny the request, then the command fails with:
"error getting credentials - err: exit status 1, out: The user name or passphrase you entered is not correct."
If I allow the request, then the command fails with:
"Error saving credentials: error storing credentials - err: exit status 1, out: The specified item already exists in the keychain."

Could be related to issue #47, but I believe that has already been resolved. I also tried downloading docker-credential-osxkeychain v0.5.0 and replacing /usr/local/bin/docker-credential-osxkeychain with that release and I had the same issue.

Reproduce docker login -u USER -p PASS HOST:8443 and observe the KeyChain prompt and credential errors. Start with /usr/local/bin/docker-credential-osxkeychain and compare its behavior with the specified repository; done means login stores credentials for the requested host without accessing a random entry or reporting that the item already exists.