Tests: don't try to return response when "no_recv" is True.

Tests: style.

Tests: fixed type of applications.

Tests: style.

Tests: skip_alert() converted to the fixture.

Tests: utils module introduced.

Tests: options moved to the separate class.

This change is necessary to separate the logic
and prevent possible circular dependency.

Tests: added Java threading tests.

Tests: fixed unit.log print.

Tests: minor fixes.

Tests: migrated to the pytest.

Refactor of process management.

The process abstraction has changed to:

setup(task, process)
start(task, process_data)
prefork(task, process, mp)

The prefork() occurs in the main process rig

Refactor of process management.

The process abstraction has changed to:

setup(task, process)
start(task, process_data)
prefork(task, process, mp)

The prefork() occurs in the main process right before fork.

The file src/nxt_main_process.c is completely free of process
specific logic.

The creation of a process now supports a PROCESS_CREATED state. The
The setup() function of each process can set its state to either
created or ready. If created, a MSG_PROCESS_CREATED is sent to main
process, where external setup can be done (required for rootfs under
container).

The core processes (discovery, controller and router) doesn't need
external setup, then they all proceeds to their start() function
straight away.

In the case of applications, the load of the module happens at the
process setup() time and The module's init() function has changed
to be the start() of the process.

The module API has changed to:

setup(task, process, conf)
start(task, data)

As a direct benefit of the PROCESS_CREATED message, the clone(2) of
processes using pid namespaces now doesn't need to create a pipe
to make the child block until parent setup uid/gid mappings nor it
needs to receive the child pid.

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Tests: style.

Tests: introduced module version specification in prerequisites.

Tests: minor fixes and style.

Tests: add helper for form-data and multipart.

Tests: fixed tests to run as root.

- The mode of testdir was changed to allow reading from other users/groups.
- The java multipart test now uploads the file into an app writable dir.
- The build di

Tests: fixed tests to run as root.

- The mode of testdir was changed to allow reading from other users/groups.
- The java multipart test now uploads the file into an app writable dir.
- The build directory was made readable for other users.
- The python environment test now uses the HOME env var instead of PWD
because the latter is not set by the root shell (/bin/sh) by default.
- The node `node_modules` directory now is copied into the `testdir` instead
of using symlinks.

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Tests: refactored prerequisites model.

Java: implementing multipart message support.

This closes #265 issue on GitHub.

Tests: Java multipart test.

Tests: fixed test_java_conf_error to pass with "--modules=" option.

Tests: more Java tests.

Added test with war file and error configuration test.

Tests: adjusted inactive interval in Java app for slow hosts.

Tests: fixed tests without "Host" header.

Tests: speed up tests.