Fix sip show peers port output, align columns, and fix ami port output.

Fix sip show peers port output, align columns, and fix ami port output.

A previous patch I committed from ASTERISK-16930 unexpectedly changed some output for
the AMI action "sippeers" which this patch changes back. Also, this aligns the output
for the cli command "sip show peers" and fixes another issue that patch introduced by
using ast_sockaddr_stringify calls multiple times without immediately using the pointer.
I also went ahead and did a little janitorial work to clean up whitespace in
_sip_show_peers.

(issue ASTERISK-16930)
(closes issue ASTERISK-19281)
Reported by: Patrick El Youssef
Patches:
	ASTERISK-19281.diff uploaded by Walter Doekes (license 5674)

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@353769 65c4cc65-6c06-0410-ace0-fbb531ad65f3