Werk #16406: cmk-update-config: Don't Prompt User if Using Conflict Mode "install" or "keepold"

While upgrading with cmk-update-config, the user can be prompted with questions about the next update steps. This questioning can be disabled by using one of the conflict options install, keepold or abort. Due to a regression in the 2.3.0b1 the options install and keepold do not supress these questions. In particular, if there is a problem while Verifying the Checkmk configuration..., then the update of Checkmk on Checkmk appliances will exit with a traceback. Upgrading to the 2.3.0b1 is thus only possible here, if all problems are fixed beforehand.

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