hsa: Add multiple listeners support

hsa: Add multiple listeners support

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 <[email protected]>