check for timeout on socket read when we check for ECONNRESET and eof

previously, we'd die on an assert() (really nasty for threaded MPM) when
we hit a keepalive timeout for a browser like netscape which keeps the
connection open


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@90244 13f79535-47bb-0310-9956-ffa450edef68