Revert "Fixing typoe in support for new service class name for Search API RC4 as per Drupal.org issue #1407282."

This reverts commit b8f5e77d4841ccd29c28b883b8c80e56d2f0ed50.
Revert "Support for new service class name for Search API RC4 as per Drupal.org issue #1407282."

This reverts commit f89d6a5e8f41124a92fa27a457000d3c8068a6a2.
Updated support for new service class name for Search API RC4. This uses hook_search_api_service_info_alter() to add the class and maintains legacy support for RC2