Node.js: renamed "require_shim" to "loader".

Tests: minor fixes.

Tests: Python targets.

Tests: added test to check port release.

Tests: fixed incorrect "--restart" mode performing.

Tests: added test for TLS with IP in SAN.

Node.js: a shim for overriding "http" and "websocket" modules.

Also added stubs for Server.address()
This was done to prevent crashes in some popular frameworks like express

Supports both CommonJS

Node.js: a shim for overriding "http" and "websocket" modules.

Also added stubs for Server.address()
This was done to prevent crashes in some popular frameworks like express

Supports both CommonJS and the new ES Modules system syntax e.g:

app.js:
const http = require('http')

app.mjs:
import http from "http"

Usage on Node 14.16.x and higher:
{
"type": "external",
"processes": {"spare": 0},
"working_directory": '/project',
"executable": "/usr/bin/env",
"arguments": [
"node",
"--loader",
"unit-http/require_shim.mjs"
"--require",
"unit-http/require_shim",
"app.js"
]
}

Usage on Node 14.15.x and lower:
{
"type": "external",
"processes": {"spare": 0},
"working_directory": '/project',
"executable": "/usr/bin/env",
"arguments": [
"node",
"--require",
"unit-http/require_shim",
"app.js"
]
}

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Tests: temporary dir removed after tests execution.

Tests: added test for TLS with empty Subject field.

Tests: PHP test with getting variable before the script is loaded.

Tests: MIME filtering

Tests: added tests for openat2() features.

Tests: fixed "skip" descriptors check flag for controller.

Tests: preserving unit.log when run without restart.

Introducing "unit.log.Log" class for "unit.log" file management.
Moving "findall()" function into TestApplicationProto.
Using "os.kill()" to send

Tests: preserving unit.log when run without restart.

Introducing "unit.log.Log" class for "unit.log" file management.
Moving "findall()" function into TestApplicationProto.
Using "os.kill()" to send signals.

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Tests: style.

Tests: unset LC_ALL variable in Ruby encoding test.

This change is necessary to set Encoding.default_external value correctly.

Tests: removed skip_alert().

Tests: added file descriptor leak detection.

Tests: SNI.

Tests: added test for Ruby default encoding.

Tests: fixed racing condition in websocket test 5_15.

Test case: "send a text message split into two fragments, then a continuation
frame with FIN = false where there is nothing to continue, then an

Tests: fixed racing condition in websocket test 5_15.

Test case: "send a text message split into two fragments, then a continuation
frame with FIN = false where there is nothing to continue, then an unfragmented
text message, all sent in one chop".

The test case investigates immediate connection closing since there is no
message to continue.

The mirror server may send a response for the first frame before the test
сontinuation frame is received by the router. In this case, the test will
receive a text frame before the close frame.

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Java: upgrading third-party components.

Tests: fixed tests to work without openssl support.

Tests: added regex check.

Tests: clear certificates after each test.