topicctl get action to fetch controllerid and clusterid

[ssingudasu]

Description

topicctl get action currently does not get the Kafka active controller broker id and cluster id

This PR is to implement actions topicctl get controllerid and topicctl get clusterid for the Kafka cluster

Usage

build topicctl

# cd /path/to/topicctl
# go build -o ./build/topicctl -a ./cmd/topicctl

topicctl get controllerid

# ./build/topicctl get controllerid --broker-addr {HOST}:{PORT}
# ./build/topicctl get controllerid --zk-addr {HOST}:{PORT}
# ./build/topicctl get controllerid --zk-addr {HOST}:{PORT} --zk-prefix {ZK_PREFIX}

topicctl get clusterid

# ./build/topicctl get clusterid --broker-addr {HOST}:{PORT}
# ./build/topicctl get clusterid --zk-addr {HOST}:{PORT}
# ./build/topicctl get clusterid --zk-addr {HOST}:{PORT} --zk-prefix {ZK_PREFIX}

local test

# cd /path/to/topicctl
# ./scripts/set_up_net_alias.sh
# docker-compose up -d
# KAFKA_TOPICS_TEST_BROKER_ADMIN=1 go test -count 1 -p 1 ./...

NOTE:

• test cases have been implemented for GetControllerID since GetClusterID already has test cases

[petedannemann]

Looks good, I left one suggestion