Fix compatibility issues with Magento 2.2.x
This release fixed some errors showing on Magento 2.2.0 and 2.2.1. Basically dependency on \Magento\Framework\HTTP\ZendClientFactory got removed.
- Fixed an exception showing on cache management screen by replacing \Magento\Framework\HTTP\ZendClientFactory with \Magento\Framework\HTTP\ClientFactory.
- Fixed an exception logged on cache backend selection.
- Shell purge handling now uses \Magento\Framework\HTTP\ZendClient directly instead of ZendClientFactory.