Correctly load configuration when instantiating new client without kwargs

[anishasthana]

The init function of PodmanClient was never loading the system configuration when no kwargs were specified. This change makes it so that we load the core data (base_url and identity) from the config file.

[openshift-ci[bot]]

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[lsm5]

@anishasthana The testing-farm:.. tests are failing across the board in the same manner. See: https://artifacts.dev.testing-farm.io/1b8ffa29-81a8-4923-8dba-ae02e308326b/ for fedora rawhide logs.

@inknos @jwhonce PTAL.