It is desirable that http cli server can support multiple listeners.
This is needed for supporting both ip4 and ip6 at the same time.
Added the optional keyword listener add | del to the
http cli server command.
Example usage: start ip4 default uri and then add ip6 uri
http cli server
http cli server uri http://2001::2/80 listener add
Type: improvement
Change-Id: I884a4cd64ff676f9759a062b6d607a1742f610f3
Signed-off-by: Steven Luong <sluong@cisco.com>
6b3b6072e0