Implement repetition of files using pytest_collect_file hook: run
file collection as many times as needed to cover all --mode/--repeat
combinations. Also move disabled test logic to this hook.
Store build mode and run_id in pytest item stashes.
Simplify support of C++ tests: remove redundant facade abstraction and put
all code into 3 files: base.py, boost.py, and unit.py
Add support for `run_first` option in test_config.yaml
Move starting LDAP to the method where the rest of the services are
started. This will unify the way of starting the 3rd party services.
Fix LDAP tests flakiness due not possible to connect to LDAP server
Add catching stdout and stderr of toxiproxy-cli in case of errors
Add posibility to run ldap tests with pytest.
LDAP server will be created for each worker if xdist will be used.
For one thread one LDAP server will be used for all tests.
