Remove docker's unsupported capabilities

The 'supports_recreate' flag needs the driver to support the evacuate
operation. The 'has_imagecache' flag needs the driver to implement the
'manage_image_cache' method. Docker does not currently support these
two functions, so the capabilities flags should not be set.

Partial-Bug: #1261636

Change-Id: I191d0d8cd35aece52462c0477f2d89897bb762c1
Merge "Remove docker's unsupported capabilities"