CP-7686: Make check-for-updates work in the presence of service packs by using the new fields from updates.xml, requiredpatches and conflictingpatches.

Signed-off-by: Mihaela Stoica <mihaela.stoica@citrix.com>
CP-7686: Make check-for-updates work in the presence of service packs by using the new fields from updates.xml, requiredpatches and conflictingpatches.

Changed the way the dependency patches are fetched, to avoid getting an exception if
requiredpatches/conflictingpatches node has at least one child that has no uuid attribute,
also checking the child name

Signed-off-by: Mihaela Stoica <mihaela.stoica@citrix.com>
Merge branch 'master' of https://github.com/xenserver/xenadmin
Merge pull request #17 from MihaelaStoica/master

CP-7686: Make check-for-updates work in the presence of service packs by...