Fix a validation issue
Fix a validation issue

We want to validate the result only if the iallocation run was a
success.

Signed-off-by: René Nussbaumer <bc755ac45a0e799d1d490cba76febc56d80cc5fc@google.com>
Reviewed-by: Michael Hanselmann <68b67885ff74281219b4a4be33cc20fd45078d7c@google.com>
Reviewed-by: Bernardo Dal Seno <dcdd79c5479cb9d1329ec01d126f02cb045aa103@google.com>

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