Adding PHP Version Description to log and console

The PHP version selection is enabled.
The PHP version description is showed in the logs and console.

Below, we can see a php deployment example which specifies the required target PHP version through ```php.version```.

``` yaml
name: PHP-DB-Brooklyn-Dsktp-54
services:
- serviceType: brooklyn.entity.webapp.apache.ApacheServer
  name: Apache Server
  location: aws-ec2:us-west-2
  php.version: 5.4
  brooklyn.config:
    http_port: 80
    app_git_repo_url: https://seaclDem:seaclouds@bitbucket.org/seaclDem/nurocasestudyphp5-4.git   
    db_connection_file_config: config/config.php
    db_connection_config_params:
      g_DatabaseHost: $brooklyn:formatString("%s", component("db").attributeWhenReady("host.address"))
      g_DatabaseName: database1
      g_DatabasePassword: br00k11n
      g_DatabaseUser: brooklyn
```