add log redaction command line tool to mask tagged entries

In support of SDK logs and other tools, a CLI tool that will convert tagged logs into hashed values consistent with the rest of the redaction done by the cluster. To facilitate scripting by end users, it would be great to also support unix pipe for redirection.

EXAMPLES

Imagine a utility named cb-redact…

Read the input log file specified, hash tagged entries, write to output file specified.

$ cb-redact tomcat.log tomcat-redacted.log

Read stdin, hash tagged entries, write to stdout.

$ cat tomcat.log > tomcat-redacted.log | cb-redact

(typically this would be used in a more interesting pipeline)

This will probably need to be large file capable, as in some use cases these could be >4GB in size.