Save off the seinfo value with packages.list.

Patch adds the seinfo label per package to the file.
This is of particular interest to the run-as program
which uses the seinfo tag to correctly label the
app security context before running the shell.

Change-Id: I9d7ea47c920b1bc09a19008345ed7fd0aa426e87
Signed-off-by: rpcraig <rpcraig@tycho.ncsc.mil>