Import latest app updates from streamline

An updated set of source files and initialization was provided by streamline to
address issues observed during initial testing. These files have been updated in
order to generate a new set of app images.

docker/streamline-src/vendor/guzzlehttp/psr7/src/LazyOpenStream.php

@@ -1,49 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace GuzzleHttp\Psr7;
-
-use Psr\Http\Message\StreamInterface;
-
-/**
- * Lazily reads or writes to a file that is opened only after an IO operation
- * take place on the stream.
- */
-final class LazyOpenStream implements StreamInterface
-{
-    use StreamDecoratorTrait;
-
-    /** @var string */
-    private $filename;
-
-    /** @var string */
-    private $mode;
-
-    /**
-     * @var StreamInterface
-     */
-    private $stream;
-
-    /**
-     * @param string $filename File to lazily open
-     * @param string $mode     fopen mode to use when opening the stream
-     */
-    public function __construct(string $filename, string $mode)
-    {
-        $this->filename = $filename;
-        $this->mode = $mode;
-
-        // unsetting the property forces the first access to go through
-        // __get().
-        unset($this->stream);
-    }
-
-    /**
-     * Creates the underlying stream lazily when required.
-     */
-    protected function createStream(): StreamInterface
-    {
-        return Utils::streamFor(Utils::tryFopen($this->filename, $this->mode));
-    }
-}