trace-cmd: Split out binding a port and fork reader from open_udp()
trace-cmd: Split out binding a port and fork reader from open_udp()

Split out binding a port and fork reader from open_udp() for avoiding duplicate
codes between listen mode and virt-server mode.

Changes in V2: Add a comment in open_udp()

Link: http://lkml.kernel.org/r/20130913020630.28927.94339.stgit@yunodevel

Signed-off-by: Yoshihiro YUNOMAE <ac8be5af0813417580b5f61951eb565904da1b77@hitachi.com>
Signed-off-by: Steven Rostedt <43232e92d70cc7aa53504ad0397085ee47bad87f@goodmis.org>

bigzz/trace-cmd,bigzz/trace-cmd