task*: rename to packagegroup to match oe-core

Open-webOS-DCO-1.0-Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Change-Id: I5c283578bd9a2707fefe7fd51c4c1b1f68eafa66
Reviewed-on: http://g2g.palm.com/1097
Reviewed-by: Martin Jansa <martin.jansa@palm.com>
Tested-by: Martin Jansa <martin.jansa@palm.com>
Reviewed-by: Susan Montooth <susan.montooth@palm.com>
packagegroup: provide upgrade path from task-* recipes

* add RPROVIDES/RREPLACES/RCONFLICTS so that task-* packages are
  replaced by packagegroup-* packages during upgrade on target
* PR bumped in next commit

Open-webOS-DCO-1.0-Signed-off-by: Martin Jansa <martin.jansa@gmail.com>
Change-Id: Iaa01ee995387ac78b0c50a5c57a91abd2051fff0
Reviewed-on: http://g2g.palm.com/1098
Reviewed-by: Susan Montooth <susan.montooth@palm.com>
Tested-by: Susan Montooth <susan.montooth@palm.com>