add some minimal security to the admin console, requiring a passphrase to be...

add some minimal security to the admin console, requiring a passphrase to be entered when updating the clock offset
this works by a simple substring match of the URL - if the router.config contains the adminTimePassphrase=blah, the time update will only succeed if the URL contains "blah" in it
if the router.config does NOT contain an adminTimePassphrase, the time update WILL BE REFUSED.
aka to use the timestamper, you MUST set adminTimePassphrase AND update the clientApp.0.args= line to include the passphrase in the URL!
e.g.
 clientApp.0.args=http://localhost:7655/setTime?blah pool.ntp.org pool.ntp.org pool.ntp.org