'amp log -f' first working implementation

[bquenin]

#11

In order to test this PR:

./swarm stop
./swarm pull
./swarm start --min

In order to circumvent an issue (#69) in accessing kafka from amplifier, you need add kafka container hostname to your machine /etc/host.

Getting kafka hostname:

docker ps
docker inspect kafka_container_id | grep hostname
sudo cat /var/lib/docker/containers/a4424bcafbab110b67922994243aca15fc57ab3422fdec21f7460fe16b024456/hostname

Update /etc/hosts in order to assign 127.0.0.1 to kafka hostname:

127.0.0.1   localhost a4424bcafbab

Then test as follows:

make
amplifier
amp logs --f
amp logs --f --short

[subfuzion]

@bertrand-quenin Just letting you know I'll go ahead and resolve the conflicts so we can get the PR merged asap.

[subfuzion]

You can also run ./swarm restart --min to do the same as the three steps in the description.

[subfuzion]

This is all you need to do to get the hostname for now (researching if there's a better way):

docker ps --filter "name=kafka\." --format '{{ .ID }}'

I explain it in more detail here: #69 (comment).

[subfuzion]

Rebased on master.

[subfuzion]

Very nice, the streaming works well. I would like to make a few changes with the flags you created, but I don't want to hold up this PR. We can tackle those changes later.

👍