HPCC-10392 Add documentation for VBox fix

This fix corrects the issue where VM's will not start on VBox after
os upgrade.

Signed-off-by: Philip Schwartz <philip.schwartz@rackspace.com>
Merge pull request #5130 from pschwartz/vm_docs_faq_mac_osx_10.9

HPCC-10392 Add documentation for VBox fix

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>