split nats_stream_forward out into a separate job

+ colocate it with nats

Signed-off-by: Glenn Oppegard <goppegard@pivotallabs.com>
switch to gnatsd

still a single job; no cluster support

Signed-off-by: Glenn Oppegard <goppegard@pivotallabs.com>
bump taskmaster's yagnats for gnatsd

Signed-off-by: Glenn Oppegard <goppegard@pivotallabs.com>
clustered gnatsd support

Bumps all of our components to use newer NATS clients and have
configuration that supports multiple NATS nodes.

[#60443956]
switch to running ruby nats server for now

Will switch to gnatsd later; committing config changes and other bumps
first.

Signed-off-by: Eric Malm <emalm@pivotallabs.com>