When we do not have root __init__.py tests must to import testgres through

"import testgres"

not through

"from <relative_path> import testgres"

* [FIX] Tests include testgres by right way through import

When we do not have root __init__.py tests must to import testgres through

"import testgres"

not through

"from <relative_path> import testgres"

* [#240] Using of node.psql with other host and port

This patch adds the support of using other host and port in the following methods:

- PostgresNode.psql (explicit new args: host and port)
- PostgresNode.safe_psql (indirectly through **kwargs)

It allows to run psql utility from one PostgreSQL instance to work with another one.

If explicit host and port are not defined (are None), PostgresNode will use own ones.

This patch closes #240.

When we do not define TEST_CFG__LOG_DIR it is expected the testgres tests will create a log directory in a root of testgres project folder.

We used config.rootpath for detect this folder in pytest_configure function.

It was occurred that config.rootpath can point to another (unexpected) place.

So we will use exact code to calculate testgres project folder (see TestStartupData.GetRootLogDir) to avid this problem.

Let's "release" all our test nodes correctly.

* [test] TestTestgresLocal.test_pg_ctl_wait_option is corrected

Let's "release" all our test nodes correctly.

* [test] TestTestgresLocal.test_simple_with_bin_dir is corrected

Let's "release" all our test nodes correctly.

This patch has the following changes:

1) It adds a new argument release_resources to PostgresNode::cleanup method. Default value is False.

2) It fixes a port number leak in NodeBackup::spawn_replica through explicit call of PostgresNode::cleanup(release_resources=True).

Closes #249.

…eric and LocalOperations (#251)

* [Refactoring] Default port manager functions now use PortManager__Generic and LocalOperations

This patch deletes a duplication of port manager code.

Now utils.reserve_port and utils.release_port works through _old_port_manager - it is a global instance of PortManager__Generic that uses a global instance of LocalOperations.

This commit is a part of work for #247.

* [BUG FIX] PortManager__ThisHost::__new__ had MT-problem

After MT-lock we must to check __class__.sm_single_instance again.

Refactoring
 - PortManager__ThisHost::__new__ is replaced with an explicit PortManager__ThisHost::get_single_instance()
 - PortManager__ThisHost::__init__ is deleted

This patch implements the proposal #244 - detach PostgresNode from ConnectionParams object.

It will use os_ops object only.

conn_params is saved but must be None. It will be removed in the future.

* LocalOperations::get_single_instance is added

This patch forces testgres to use a single instance of LocalOperations that is created with default parameters.

Note that, PortManager__ThisHost is used only when PostgresNode uses this single local_ops instance.

Signatures:
 def makedir(self, path: str)
 def rmdir(self, path: str)

It is a part of work for #247.

Signature:
 def get_tempdir(self) -> str

This patch must fix a problem in test_pg_ctl_wait_option when his PostgreSQL instance conflicts with another one.

For this, we added two new things:
 - PostgresNodeLogReader
 - PostgresNodeUtils

PostgresNodeLogReader reads server logs.

PostgresNodeUtils provides an utility to detect a port conflict.

PostgresNode::start also uses these new classes.

The version of supported Python is corrected.

…ed (#259)

* [#258] Declaration of ProbackupTest::pg_node is corrected

ProbackupTest::pg_node is testgres.NodeApp, not testgres.PostgresNode.

Asserts are added.

* [#258] TestBasic::test_full_backup cleans node object

Node cleanup is added.

TODO: we should to stop node only and cleanup his data in conftest.

- the calls of logging.root.handle are handled (LogWrapper2)
- critical errors are processed