un-noticeable infrastructure

when expected infrastructure works, we tend not to notice it.  so ietf51
attendees may not notice that the net works, the wireless has been up since
friday evening, etc.  along with not noticing it, we don't think of the folk
who made it work.  so, if you see the folk in bt blue, gary, christian,
franco, ..., say thanks.

[ no, this message was not meant to jinx the whole thing ]

randy