Revert "run-as: Get seinfo from packages.list and pass to libselinux."

This reverts commit fced3ded831cb084121b10a78c12de99c89004aa.
Revert "run-as:  set the SELinux security context."

This reverts commit 4ead8beac8fe59b01ad1e5670713b99e7f841b9b.