Fix incorrect editable flag when packaging.
Fix incorrect editable flag when packaging.

'editable' flag was being mistakenly set while packaging.
Fixed that not to happen. STv3 packages are still editable
in development mode, however.

Change-Id: I4587477ca39d4026381af22cc9cc32b6ed2e76d9

openstack/stacktach-sandbox,stackforge/stacktach-sandbox,stackforge/stacktach-sandbox,openstack/stacktach-sandbox,stackforge/stacktach-sandbox,openstack/stacktach-sandbox