PHP 7.3 v2 Specialization (#1110)

* Added support for PHP 7.3 v2 Specialization
* Add builder dockerfile for PHP7
* Support mcrypt in PHP 7.3

examples/php7/multifile/README.md

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+This is an example of creating a deployment package with multiple
+files including external libraries via composer.
+
+### Create an environment
+
+```
+fission env create --name php --image fission/php-env:latest --builder fission/php-builder:latest --version 2
+```
+
+### Create a zip file with all your files
+
+```
+zip -r multifile.zip . -i *.php *.txt composer.json
+```
+
+### Create a package
+```
+fission package create --sourcearchive multifile.zip --env php
+```
+This command will print the created package. We will use it in the next step.
+
+
+### Create a function
+
+Since there are multiple files, you have to specify an _entrypoint_ to
+for the function.  Its format is `<file path>::<function name>`. In our
+example, that's `handlers/FileReader.php::execute`, to run function `execute` in `handlers/FileReader.php`.
+
+```
+fission function create --name multifile --env php --pkg <created-pkg-name> --entrypoint "handlers/FileReader.php::execute"
+```
+
+### Test it
+
+```
+fission function test --name multifile
+```
+
+You should see the "Hello, world" message.
+
+
+## Updating the function
+
+### Edit a file
+
+```
+echo "I said hellooooo!" > message.txt
+```
+
+### Update the deployment package
+
+```
+zip -r multifile.zip . -i *.php *.txt composer.json
+```
+
+### Update the package
+
+```
+fission package update --name <created-pkg-name> --sourcearchive multifile.zip --env php
+```
+
+### Test it
+
+```
+fission function test --name multifile
+```
+
+You should now see your new, edited message.
+

examples/php7/multifile/composer.json

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+{
+    "name": "example/php7",
+    "description": "Example for php7 environment",
+    "require": {
+        "psr/log": "^1.1",
+        "psr/http-message": "^1.0"
+    },
+    "authors": [
+        {
+            "name": "Alberto Lopez",
+            "email": "alberto.lopez.benito@gmail.com"
+        }
+    ]
+}

examples/php7/multifile/handlers/FileReader.php

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+<?php
+
+use Psr\Http\Message\ResponseInterface;
+use Psr\Log\LoggerInterface;
+
+require __DIR__ . '/../vendor/autoload.php';
+
+function execute($context)
+{
+    /** @var ResponseInterface $response */
+    $response = $context["response"];
+    /** @var LoggerInterface $logger */
+    $logger = $context["logger"];
+    $response->getBody()->write(file_get_contents(__DIR__ . '/message.txt'));
+    $logger->debug('File read: example.txt');
+}

examples/php7/multifile/handlers/message.txt

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+I said hellooooo!