Deprecating SSHUserListBoxModel in favor of StandardUsernameListBoxModel.
Its only special feature, withSystemScopeCredentials, was not being called anyway.
Unused import.
ReadFileOnMaster etc. did not actually work.
Simpler and better to writeReplace a DirectEntryPrivateKeySource.
[maven-release-plugin] prepare release ssh-credentials-1.10
[maven-release-plugin] prepare for next development iteration