Some projects use the same gpg key. To avoid osc from quitting when
building against two or more such projects at the same time ignore
gpg key import errors as long as at least one key could be imported.
The build service is not ready for that yet. Almost all projects
that are not built but only imported to the build service have wrong
keys. To enable the new code set builtin_signature_check in .oscrc. You
may need to manually overwrite wrong _pubkey files in the
packagecachedir with correct keys until the build service is fixed.
