Reduce code complexity in flake file

[dsrivastavv]

Reduce code complexity to improve code quality. It's currently set to 15 in flake8 config file.

[dsrivastavv]

If reduced to 10, the following errors need to be fixed :

.\lisa\runner.py:235:5: C901 'RootRunner._start_loop' is too complex (15)
.\lisa\search_space.py:97:5: C901 'IntRange.check' is too complex (12)
.\lisa\search_space.py:299:1: C901 'check_countspace' is too complex (13)
.\lisa\runners\legacy_runner.py:629:1: C901 '_track_progress' is too complex (13)
.\lisa\sut_orchestrator\azure\platform_.py:601:5: C901 'AzurePlatform._get_environment_information' is too complex (15)
.\lisa\sut_orchestrator\azure\platform_.py:728:5: C901 'AzurePlatform._get_location_info' is too complex (11)
.\lisa\sut_orchestrator\azure\platform_.py:809:5: C901 'AzurePlatform._create_deployment_parameters' is too complex (15)
.\lisa\sut_orchestrator\azure\platform_.py:1183:5: C901 'AzurePlatform._resource_sku_to_capability' is too complex (11)
.\lisa\tools\reboot.py:50:5: C901 'Reboot.reboot' is too complex (12)
.\lisa\util\process.py:63:5: C901 'Process.start' is too complex (12)
.\lisa\util\process.py:144:5: C901 'Process.wait_result' is too complex (13)