Only grab the first disk when grabbing first disk selected

It always grabbed all unclaimed disks before.
Clean partition (and partition table) to let pvcreate succeed

If there is other stuff remaining on the partition for cinder,
pvcreate will fail. So when the disk is grabbed,clean it, and
then run pvcreate. Fixes
https://bugzilla.novell.com/835942
Merge pull request #64 from dirkmueller/fix_first_grabbing

Only grab the first disk when configured to do so
Merge pull request #65 from dirkmueller/clear_disk_before_pv

Clear disk before pv
Merge pull request #67 from vuntz/use-sections

webui: Use sections to group options belonging together
Fixes to SSL certificate generation

Several fixes, including:
 - do not recreate the certificate if it already exists
 - do not change permissions on directories that might be different than
   what we expect (code was assuming it was always
   /etc/<component>/ssl/{certs,private})
 - make private key non-readable by the world
webui: Some fixes related to SSL generation too

This includes:
  - really set insecure to true when generating certificate (it wasn't
    set in the json)
  - also make the path to certificate and key files disabled
webui: Fix string to be consistent

self-signed, instead of auto-signed.
webui: Set xxlarge class on file type inputs

For text input fields that take large amount of data (like a full file +
path), setting input-xxlarge class helps with getting a proper display
when using bootstrap.