we do not need digests for Exchange-peers
add a hint for autodiscover over HTTP
Revert "add a hint for autodiscover over HTTP"

This reverts commit 9485b386dba7a4fbdfbc7941071cd4574f24c91c.
autocreate http-reverse for autodiscover
Merge pull request #687 from trendchiller/master
Bump squid3 version due to last changes