bitrot management and API support in GD2

[atinmu]

Things to be done

Bitrot management daemon

ReST APIs to be defined:

volume bitrot <VOLNAME> {enable|disable} volume bitrot scrub-throttle {lazy|normal|aggressive} volume bitrot scrub-frequency {hourly|daily|weekly|biweekly|monthly} volume bitrot scrub {pause|resume|status|ondemand}

[atinmu]

Checklist

• [ ] ReST APIs availibility in wiki
• [ ] CLI commands
• [ ] Sufficient logging
• [ ] Availibility of metrics data if applicable
• [ ] Xlator options table upto date?
• [ ] Test cases & test coverage of the functionality

[atinmu]

@kotreshhr Please cross check the check list for the completion of the items and start ticking out the ones which are being completed here.

[kotreshhr]

The checked ones are working via REST API

• [x] volume bitrot {enable|disable}
• [x] volume bitrot scrub-throttle {lazy|normal|aggressive}
• [x] volume bitrot scrub-frequency {hourly|daily|weekly|biweekly|monthly}
• [x] volume bitrot scrub {pause|resume|ondemand}
• [x] volume bitrot scrub {status}\
• [x] CLI support for all above

[kotreshhr]

This is mostly done. Need to go through if there any pending TODOs and add tests