QPID-3689: Change tcp nodelay to be the default
This change also alters the implementation of simple switch
like options when using boost version 1.35 and later. We now
allow these switches to also take an optional "=yes" or "=no"
(and similar) argument.

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1469088 13f79535-47bb-0310-9956-ffa450edef68