Add auditing to server CLI.
Also:
- simplify auditing in API layer
- reduce number of AddMeta calls
- have models serialize themselves
- more consistent field naming
* MM-23222 add file target (with rotation) to audit
* MM-23222 mirror syslog audits to local filesystem
* provides config options for file name, max size, max age
* rotates files based on max size and max age; delete as needed based on max backups
* include cluster id in log records
* sort meta data fields
* New auditing API outputting to syslog via TLS
* New config section for specifying remote syslog server IP, port, and cert.
* Legacy audit API retained for access history feature
* Consistent license message for all the go files
* Fixing the last set of unconsistencies with the license headers
* Addressing PR review comments
* Fixing busy.go and busy_test.go license header
* Migrating audit store
* Final migration example for the audit store
* async example
* Ending migration
* Removing Async helper
* Fixing tests
* Fixing govet problems with the StoreResult instanstiation
