Fix misspelling regex and error in test_cluster_connection

[roronoasins]

Related issue
#4391

Description

The test case where the connection pattern is searched, it is not well formatted.

Updated

• test_cluster_connection Successfully connected to master pattern fixed
• test_cluster_connection Successfully connected to master error message fixed
• Update README
• Fix some loggers info and debug level messages

These changes were tested with the artifacts within this issue #4386, so it fails as expected because the artifact generated had some errors.

        if disconnected_nodes:
>           pytest.fail(f'The following nodes disconnected from master at any point:\n- ' + '\n- '.join(disconnected_nodes))
E           Failed: The following nodes disconnected from master at any point:
E           - worker_3
E           - worker_1
E           - worker_2
E           - worker_24
E           - worker_21
E           - worker_22
E           - worker_23
E           - worker_11
E           - worker_20
E           - worker_9
E           - worker_15
E           - worker_17
E           - worker_18
E           - worker_14
E           - worker_12
E           - worker_4
E           - worker_10
E           - worker_7
E           - worker_25
E           - worker_6
E           - worker_13
E           - worker_8
E           - worker_5
E           - worker_19
E           - worker_16

Evidences

report_test_cluster.zip

[damarisg]

The description should contains the evidence that this changes work succesfull.

[pro-akim]

Update

Report checked
Linter test failing but it is not related with new changed done in the PR.
LGTM