Really fix solaris -HUP problem with slack dup of sockets. Undo prior

change and move ap_slack after all of the rest of the socket initialization,
which apparently is needed for SO_REUSEADDR to survive the dup on Solaris.
Also block SIGHUP and SIGUSR1 during restart on all platforms.

PR: 832
Submitted by:	Dean Gaudet
Reviewed by:	Roy Fielding


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3@78889 13f79535-47bb-0310-9956-ffa450edef68