Standardize influx CLI '--retention' type and accepted duration units

[sanderson]

Right now, two influx commands accept a --retention flag when creating a bucket.

• influx setup
• influx bucket create

influx setup's --retention flag expects an integer that represents the retention period in nanoseconds. influx bucket create expects a duration, but only in units up to hours.

Proposal:
Both commands should expect the same data type for the bucket retention period. We should also accept day and week duration units.

Current behavior:
Retention flags expect different input types. The one that does expect a duration value only accepts ns, us, ms, s, and h.

Desired behavior:
Retention flags should expect the same input type. In addition to the duration units already supported, they should also support days d, and potentially even weeks w.

Use case:
Better UX

[jsteenb2]

@sanderson do you have any suggestion for what the description of retention period should read? While we got the hood open...

[sanderson]

@jsteenb2 Duration bucket will retain data

[sanderson]

@jsteenb2 from influx setup -h:

-r, --retention duration   Duration bucket will retain data. 0 is infinite. Default is 0. (default -1ns)

Is the default for retentions 0 or -1ns?

[jsteenb2]

0 will default to infinite retention period