Migrate several test groups of `test_logcollector` documentation to `qa-docs` #2180

… Docs style The following groups have been documentated: * test_location * test_location_custom_sockets * test_log_format * test_only_future_events * test_options * test_reconnect_time * test_statistics The current scheme of the issue #1694 has been used. PEP-8 fixes. Related: #1813

…migrate-doc-logc-location-log-only-fut-rec-stats

…t-rec-stats