kafka io attack: add username and password flags

[cwen0]

Signed-off-by: cwen0 cwenyin0@gmail.com

add username and password flags to fix this

Chaosd will access Kafka server to get partitions when to exec io attack. So username, password, host, and port should be supported.

chaosd/pkg/server/chaosd/kafka.go

Lines 385 to 387 in a9c0540

	func findPartitionDirs(attack *core.KafkaCommand, logDirs []string) ([]string, error) {
	partitions, err := getPartitions(attack)
	if err != nil {

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[iguoyr]

LGTM

[cwen0]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 9bcf11d