community/jimtcl: disable ipv6 test

3.15 builders fail

socket-1.8 ERR stream - ipv6
At      : socket.test:135
Expected: rc={ok return} result=hello
Got     : rc=error result={Not a valid address: localhost:0}

socket-1.9 ERR dgram - ipv6 - unconnected
At      : socket.test:154
Expected: rc={ok return} result=hello
Got     : rc=error result={Not a valid address: localhost:0}

     socket.test: Total    29   Passed    27  Skipped     0  Failed     2
------------------------------------------------------------
FAILED: 2
	socket.test:135	socket-1.8
	socket.test:154	socket-1.9