CloudKitty keystone fetcher authentication fails with internal TLS

[Pierre Riteau]

When internal TLS is enabled with a local CA, CloudKitty's keystone fetcher fails with authenticate with Keystone:

WARNING keystoneauth.identity.generic.base [-] Failed to discover available identity versions when contacting https://<VIP>:35357. Attempting to parse version from URL.: keystoneauth1.exceptions.connection.SSLError: SSL exception connecting to https://<VIP>:35357: HTTPSConnectionPool(host='<VIP>', port=35357): Max retries exceeded with url: / (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1131)')))

Noticed on Wallaby but likely to apply to all versions.