Migrate ssl truststore into a secret (Jupyter)

[planetf1]

Currently the truststore - ie the certificate chain relating the servers we trust (Egeria's root & intermediate Cases, which sign the server cert used by the server chassis) is stored in a configmap.

Generally, certificates, passwords etc should be stored in secrets as these are more secure and opaque.

In this case the exposure is negligible given

• this is only for demo purposes
• previously we didn't validate certs
• this is only an additional root certificate -- these are often provided clear text anyway when installed on an O/S
• these are only our self-signed cert chain