class/siteinfo: Fixup task dependencies to work with fstage
class/siteinfo: Fixup task dependencies to work with fstage

* Ensure siteinfo tasks are always executed after stage tasks
* Prepare for dynamic addtask of fetch unpack and patch, ensuring
  that siteinfo tasks are always executed after fetch, unpack and patch

sknsean/core,sknsean/core,hundeboll/core,hundeboll/core,hundeboll/core,sknsean/core,diorcety/oe-lite-core,diorcety/oe-lite-core,hundeboll/core,sknsean/core,sknsean/core