[#445] fix: test_failure_during_slow_start is corrected (#446)

slow_start may fails during "start" stage and raise an exception StartNodeException.

utils: public API surface is restored (#443)

run_tests-darwin is updated (cleanup)

Revision&Refactoring (#431)

* Revision&Refactoring

* node.py: imports are reordered

* consts.BINARY_NAME__POSTGRES is added

Migration to new os_ops methods: run and popen (#430)

* node::psql/safe_psql use os_ops::run

* node::_try_shutdown_internal uses os_ops::run

* node::pgbench returns OsProcessController

* node::upgrade_from uses os_ops::run

* FindPostmaster uses os_ops::run

* utils.get_pg_config2 uses os_ops::run

* utils.get_pg_version2 uses os_ops::run

Fix worker segfault on shutdown from leaked log-reader thread (#422)

Version 1.15.1

CI: optimization (astralinux_1_7) (#410)

Process the exception if pg_config is not found (#385)

Fix trial PGPRO version parse (#379)

* Fix trial PGPRO version parse

* export func and bump version

---------

Co-authored-by: snppg <s.neretin@postgrespro.ru>