Log validation service

To get log validation,

1. register log listener, to dynamically detect any log changes (log shrinking/rotation is supported), any new log records are queued to be validated.
2. run log validation. Log validation verifies actual and expected log records, shifting record from actual logs pending queue.
3. reset - optionally reset log queues, to discard pending validation logs.

Service Id	Action	Description	Request	Response
validator/log	listen	start listening for log file changes on specified location	ListenRequest	ListenResponse
validator/log	reset	discard logs detected by listener	ResetRequest	ResetResponse
validator/log	assert	perform validation on provided expected log records against actual log file records.	AssertRequest	AssertResponse