Add pom.xml for executing PHP Swagger Petstore Security Client tests

Following #3224 this adds a `pom.xml` for executing `mvn
integration-test` on the PHP Swagger Petstore Security Client tests.

The `pom.xml` is identical to the one in
`samples/client/petstore/php/SwaggerClient-php/pom.xml` with only name
and artifactId changed.

Author: arnested

samples/client/petstore-security-test/php/SwaggerClient-php/pom.xml

@@ -0,0 +1,59 @@
+<project>
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>com.wordnik</groupId>
+    <artifactId>PhpPetstoreClientSecurityTests</artifactId>
+    <packaging>pom</packaging>
+    <version>1.0-SNAPSHOT</version>
+    <name>PHP Swagger Petstore Security Client</name>
+    <build>
+        <plugins>
+            <plugin>
+                <artifactId>maven-dependency-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>copy-dependencies</goal>
+                        </goals>
+                        <configuration>
+                            <outputDirectory>${project.build.directory}</outputDirectory>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>exec-maven-plugin</artifactId>
+                <version>1.2.1</version>
+                <executions>
+                    <execution>
+                        <id>bundle-install</id>
+                        <phase>pre-integration-test</phase>
+                        <goals>
+                            <goal>exec</goal>
+                        </goals>
+                        <configuration>
+                            <executable>composer</executable>
+                            <arguments>
+                                <argument>install</argument>
+                            </arguments>
+                        </configuration>
+                    </execution>
+                    <execution>
+                        <id>bundle-test</id>
+                        <phase>integration-test</phase>
+                        <goals>
+                            <goal>exec</goal>
+                        </goals>
+                        <configuration>
+                            <executable>vendor/bin/phpunit</executable>
+                            <arguments>
+                                <argument>test</argument>
+                            </arguments>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>