pkg/logging: Use RFC3339 compatible time format

[namm2]

Signed-off-by: Nam Hai Nguyen [email protected]

Problem

Logging pkg doesn't use either RFC3339 or ISO 8601 time format, then we have to parse SSO logs specifically.

Solution

Use a valid RFC 3339 time format.

Referece: https://ijmacd.github.io/rfc3339-iso8601/

Notes

Other pertinent information. Examples: a walkthrough of how the solution might work, why this solution is optimal compared to other possible solutions, or further TODOs beyond this PR.

[svenmueller]

How can we get a PR like this reviewed and merged? @sporkmonger @mcfearsome @joelsouza @benjsto