Occassional OkHttp warning when creating key pairs in Azure Key Vault

[chris-j-h]

Sometimes when using tessera -keygen -keygenvaulttype AZURE ... the following message is printed to the console:

WARNING: A connection to <vault-url> was leaked. Did you forget to close a response body? To see where this was allocated, set the OkHttpClient logger level to FINE: Logger.getLogger(OkHttpClient.class.getName()).setLevel(Level.FINE);

Functionality does not appear to be affected but this msg does not concern the user so should be resolved or hidden.