deploy: Write bootloader config even if just kernel arguments changed

The official way to add bootloader arguments to the current deployment
is to redeploy with --karg.  However, doing so tripped up an
optimization made inside the deployment code to just swap the
bootlinks if we're keeping the same "bootcsum".

Change this optimization to look at the pair of (bootcsum, options).
admin: Add --karg-proc-cmdline argument

When installing a new tree inside an existing OS, this is a convenient
way to include the command line arguments one needs (such as root=).
Update libgsystem

This has a GsConsole fix.