Move the config files out of the way, but still install them properly.

Just rewrite that stuff completely...  Pretty simple now, right?  :)

We now use /usr/local/opnsense/version/xxx as our version database.
Apart from the core package, opnsense-update(8) also puts its own
version information in there.  To stay somewhat consistent, the
version file should resemble the package name, even though that
looks strange in our case: /usr/local/opnsense/version/opnsense.
It's just that /usr/local/etc is too open and might clash with
other things in the future.

We don't have OpenSSH in base anymore so we can zap the fallback.
And since openssh-portable is a direct dependency of opnsense, we
can be pretty sure it'll be there.

Discussed with: @deZillium (Twitter)

Just move to the actual rc script in the repo from our hook and
revert back to a simple mount inside that one.  Problem solved.

Pondering whether this is a bug in the actual file system code...

/usr/local/etc/rc is always the latest version.  Issue
popped up again since check_reload_status was replaced.

add actual memory/disc/swap usage in dashboard, feature request https://github.com/opnsense/core/issues/66

- remove the use for pfSctl, replaced with a new configd control script to be able to remove the check_reload_status port
- replace use of global $g['booting'] because some scripts use this outside the main loop which causes strange behavior ( for example dhcp client which starts a newwanip on connect ). replaced which check on file /var/run/booting which is set in rc script