addpeer uri://... (without uri=) adds the empty peer

[klemensn]

I simply forgot using the keyword when adding a peer and it resulted in my node adding a stub peer:

# yggdrasil -autoconf >/dev/null &

# yggdrasilctl getpeers
URI	State	Dir	IP Address	Uptime	RTT	RX	TX	Pr	Last Error
# yggdrasilctl addpeer tcp://1.2.3.4:5678
# yggdrasilctl getpeers
URI	State	Dir	IP Address	Uptime	RTT	 RX 	 TX 	Pr	        Last Error
   	Down 	Out	          	0s    	-  	 0kb	 0kb	0 	2s ago: link schema unknown

Passing uri= seems easy to miss and adding other peers that way looks odd:

# yggdrasilctl addpeer tcp://7.8.9.0:1234
Admin socket returned an error: peer is already configured

You can remove it via the empty string, though:

# yggdrasilctl removepeer ''
# yggdrasilctl getpeers
URI	State	Dir	IP Address	Uptime	RTT	RX	TX	Pr	Last Error

This needs stricter input validation (before adding a peer).