TST: Fix and re-enable troublesome tests

[tangkong]

Expected Behavior

Tests should pass consistently

Current Behavior

In test_console.py, three tests sporadically fail due to timeouts. In one PR, pip 3.9 passed these tests while higher versions failed (GHA, #542). In another PR, all versions python failed in the pip test suite (travis, #546)

In test_positioner.py, test_positioner_widget_with_signal_limit causes a segfault. Test suite will pass if this test is disabled. (#542)

Possible Solution

Figure out the tests

Steps to Reproduce (for bugs)

Run the test suite on gha or travis

Context

#542

Your Environment

pcds-5.6.0

[klauer]

We're looking to eventually remove the console entirely (as in #538), so I think getting test_console passing is very low priority.