Previous ApiException message would simply print out the result of the
`curl_getinfo($curl)` call, which might be useful only if the developer
actually wanted very low-level information from curl about why a call
failed. The new message should print out a higher-level but more
informative, human-readable message. If necessary for debugging, the
ApiException's responseObject is set to the `curl_getinfo($curl)`.
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.
