Use python logging infrastructure inside tests

[mwperina]

Use python logging infrastructure inside tests instead of print() to
have timestamps to be able to correlate tests logs with system logs.

Signed-off-by: Martin Perina mperina@redhat.com

[mwperina]

Before this change following output we had in the tmt log for starting a service:

13:10:49                 out: Starting unit simple.service on node node-foo                                                                                            

After the change log contains:

10:23:11                 out: 2023-09-13 10:23:11+0000,279 DEBUG   [bluechi_test.container] Starting unit 'simple.service' on node 'node-foo' (container:174)          
10:23:11                 out: 2023-09-13 10:23:11+0000,283 DEBUG   [urllib3.connectionpool] http://%2frun%2fuser%2f1001%2fpodman%2fpodman.sock:80 "POST /v4.6.0/libpod/containers/bluechi-controller/exec HTTP/1.1" 201 74 (connectionpool:473)                                                                                               
10:23:11                 out: 2023-09-13 10:23:11+0000,290 DEBUG   [urllib3.connectionpool] http://%2frun%2fuser%2f1001%2fpodman%2fpodman.sock:80 "POST /v4.6.0/libpod/exec/24f4a2eaf18472424579e267530019be7c24281224bfe202bf0ec3b9042f8b22/start HTTP/1.1" 200 None (connectionpool:473)                                                    
10:23:11                 out: 2023-09-13 10:23:11+0000,348 DEBUG   [urllib3.connectionpool] Resetting dropped connection: %2frun%2fuser%2f1001%2fpodman%2fpodman.sock (connectionpool:290)                                                                                                                                                    
10:23:11                 out: 2023-09-13 10:23:11+0000,350 DEBUG   [urllib3.connectionpool] http://%2frun%2fuser%2f1001%2fpodman%2fpodman.sock:80 "GET /v4.6.0/libpod/exec/24f4a2eaf18472424579e267530019be7c24281224bfe202bf0ec3b9042f8b22/json HTTP/1.1" 200 417 (connectionpool:473)                                                       10:23:11                 out: 2023-09-13 10:23:11+0000,350 DEBUG   [bluechi_test.container] Start unit 'simple.service' on node 'node-foo' finished with result '0'             and output:                                                                                                                                                   
10:23:11                 out: Unit simple.service start operation result: done (container:177)                                                                         

The appearance of libpod logs is a side effect caused by setting the log level to DEBUG

[engelmi]

LGTM