DTIN-4234: Cleanup tox lint target

[jmakar-s1]

• Updated cryptography requirement to recent version in tox.ini
• Black formatting of many files
• Flake8, pylint lint fixes for a handful of files
  • There was one case where I commented out dead code in scalyr_agent.builtin_monitors.thread_pool because of the following

************* Module scalyr_agent.builtin_monitors.thread_pool
scalyr_agent/builtin_monitors/thread_pool.py:72:12: E1101: Instance of 'ExecutorMixIn' has no 'finish_request' member (no-member)
scalyr_agent/builtin_monitors/thread_pool.py:74:12: E1101: Instance of 'ExecutorMixIn' has no 'handle_error' member (no-member)
scalyr_agent/builtin_monitors/thread_pool.py:76:12: E1101: Instance of 'ExecutorMixIn' has no 'shutdown_request' member (no-member)
scalyr_agent/builtin_monitors/thread_pool.py:88:8: E1101: Super of 'ExecutorMixIn' has no 'server_close' member (no-member)

• Updated scripts/verify-add-events-api-response-headers.py
• Moved docs from docs/monitors/kubernetes_monitor.md to scalyr_agent/builtin_monitors/kubernetes_monitor.py
  • docs/monitors is generated with tox -e generate-monitor-docs

[github-actions[bot]]

Test Results

       8 files   -      12         8 suites   - 12   20m 42s :stopwatch: - 11m 20s 1 370 tests  -    115  1 280 :heavy_check_mark:  -    185  90 :zzz: +  70  0 :x: ±0  1 392 runs   - 5 704  1 302 :heavy_check_mark:  - 5 569  90 :zzz:  - 135  0 :x: ±0 

Results for commit c3e41024. ± Comparison against base commit 089af0f1.

This pull request removes 115 tests.

``` tests.unit.copying_manager_tests.copying_manager_new_test.TestBasic ‑ test_checkpoints[process-1-1] tests.unit.copying_manager_tests.copying_manager_new_test.TestBasic ‑ test_checkpoints[process-2-2] tests.unit.copying_manager_tests.copying_manager_new_test.TestBasic ‑ test_checkpoints_consolidated_checkpoints[process-1-1] tests.unit.copying_manager_tests.copying_manager_new_test.TestBasic ‑ test_checkpoints_consolidated_checkpoints[process-2-2] tests.unit.copying_manager_tests.copying_manager_new_test.TestBasic ‑ test_failed_health_check_status_and_failed_worker[process-1-1] tests.unit.copying_manager_tests.copying_manager_new_test.TestBasic ‑ test_failed_health_check_status_and_failed_worker[process-2-2] tests.unit.copying_manager_tests.copying_manager_new_test.TestBasic ‑ test_generate_status[process-1-1] tests.unit.copying_manager_tests.copying_manager_new_test.TestBasic ‑ test_generate_status[process-2-2] tests.unit.copying_manager_tests.copying_manager_new_test.TestBasic ‑ test_health_check_status[process-1-1] tests.unit.copying_manager_tests.copying_manager_new_test.TestBasic ‑ test_health_check_status[process-2-2] … ```

This pull request skips 76 tests.

``` tests.unit.agent_main_test.AgentMainTestCase ‑ test_create_client_ca_file_and_intermediate_certs_file_doesnt_exist tests.unit.builtin_monitors.kubernetes_monitor_test.TestKubeletApi ‑ test_unverified_https tests.unit.builtin_monitors.kubernetes_monitor_test.TestKubernetesKubeletApiAuthTokenCaching ‑ test_kubelet_api_re_read_token_every_x_seconds tests.unit.builtin_monitors.kubernetes_monitor_test.TestKubernetesKubeletApiAuthTokenCaching ‑ test_kubernetes_api_re_read_token_every_x_seconds tests.unit.builtin_monitors.kubernetes_monitor_test.TestKubernetesKubeletApiAuthTokenCaching ‑ test_re_read_token_every_x_seconds tests.unit.builtin_monitors.linux_process_metrics_test.LinuxProcessMetricsMonitorTest ‑ test_gather_sample_by_commandline_success tests.unit.builtin_monitors.linux_process_metrics_test.LinuxProcessMetricsMonitorTest ‑ test_gather_sample_by_pid_failure_pid_doesnt_exist tests.unit.builtin_monitors.linux_process_metrics_test.LinuxProcessMetricsMonitorTest ‑ test_gather_sample_by_pid_success tests.unit.builtin_monitors.linux_system_metrics_test.LinuxSystemMetricsMonitorTest ‑ test_gather_sample_ignore_mounts tests.unit.builtin_monitors.linux_system_metrics_test.LinuxSystemMetricsMonitorTest ‑ test_gather_sample_success … ```

:recycle: This comment has been updated with latest results.

[jmakar-s1]

Closing this PR and splitting it up into two