Fix handling of disabled (shared) file storage
Fix handling of disabled (shared) file storage

The vcluster changes broke the disabling of file storage; we can
workaround by (manually) skipping the virtualisation of file storage
paths if they are not enabled.

Note that tests/QA are still broken with disabled file storage; this
patch only fixes production code.

Signed-off-by: Iustin Pop <acf83a5274f31a43af6b914614365999469c1a31@google.com>
Reviewed-by: Guido Trotter <f62ca4d5358bdaeef0e50e57f9f7e231de63727e@google.com>

yiannist/ganeti,yiannist/ganeti,apyrgio/ganeti,apyrgio/ganeti,leshchevds/ganeti,grnet/snf-ganeti,andir/ganeti,yiannist/ganeti,ganeti/ganeti,onponomarev/ganeti,dimara/ganeti,bitemyapp/ganeti,dimara/ganeti,ganeti-github-testing/ganeti-test-1,ganeti-github-testing/ganeti-test-1,grnet/snf-ganeti,ganeti/ganeti,leshchevds/ganeti,leshchevds/ganeti,apyrgio/snf-ganeti,mbakke/ganeti,apyrgio/snf-ganeti,bitemyapp/ganeti,mbakke/ganeti,ganeti/ganeti,andir/ganeti,andir/ganeti,mbakke/ganeti,onponomarev/ganeti