feat: [Operator] Retrieve autogenerated Keycloak admin user credentials

[mmorhun]

Signed-off-by: Mykola Morhun mmorhun@redhat.com

What does this PR do?

Retrieves and prints Keycloak admin-user login and password after Che installation finishes.
This implementation is done for operator and olm installers.
The same functionality has been implemented for helm installer before #686

chectl output:

    ...
    ✔ Eclipse Che pod bootstrap
      ✔ scheduling...done.
      ✔ downloading images...done.
      ✔ starting...done.
    ✔ Retrieving Eclipse Che server URL... https://che-che.192.168.99.212.nip.io
    ✔ Eclipse Che status check
  ✔ Retrieving Keycloak admin credentials... admin:2h9nRBK7SCPr
  ✔ Retrieving Che self-signed CA certificate... is exported to /home/username/cheCA.crt
  ✔ Show important messages
    ✔ Eclipse Che admin credentials are: "admin:admin". You will be asked to change default Che admin password on the first login.
    ✔ Autogenerated Keycloak credentials are: "admin:2h9nRBK7SCPr"
    ✔ ❗[MANUAL ACTION REQUIRED] Please add Che self-signed CA certificate into your browser: /home/mmorhun/cheCA.crt.
   Documentaton how to add a CA certificate into a browser: https://www.eclipse.org/che/docs/che-7/installing-che-in-tls-mode-with-self-signed-certificates/#using-che-with-tls_installing-che
-in-tls-mode-with-self-signed-certificates
Command server:start has completed successfully.

What issues does this PR fix or reference?

eclipse-che/che#14082

Depends on

eclipse-che/che-operator#240

[tolusha]

Use the constant
https://github.com/che-incubator/chectl/blob/master/src/constants.ts#L25

[tolusha]

let's skip if spec.auth.externalIdentityProvider is defined

[mmorhun]

Good catch

[tolusha]

Update yarn.lock to rely on the latest che-operator changes.

[mmorhun]

Yes, I do remember. But thank you for reminding me.