Add the ShmemUIDisUser directive and logic. Apache does not require

that the SysV shared memory segment be reset to the uid/gid of
User/Group. In fact, it's not wise that it do so. However, there are
some 3rd party "add ons" that require/expect this behavior...
So allow admins to do so, assuming they know the impacts.
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@96941 13f79535-47bb-0310-9956-ffa450edef68