Fix for instance reinstall not updating config
Fix for instance reinstall not updating config

As per issue #1193, instance reinstalls with modified OS parameters
did not persist among reinstalls and were not saved to the cluster's
config data. With this patch, this problem should be fixed.

Signed-off-by: Federico Morg Pareschi <ff862f58af48d157b995cd83870fbfa4aec8edf3@google.com>
Reviewed-by: Viktor Bachraty <a13ea37fcfcda126dc54f94389ded93f402eee93@google.com>

ganeti/ganeti,ganeti/ganeti,yiannist/ganeti,mbakke/ganeti,ganeti/ganeti,yiannist/ganeti,onponomarev/ganeti,mbakke/ganeti,andir/ganeti,mbakke/ganeti,andir/ganeti,yiannist/ganeti,andir/ganeti,onponomarev/ganeti