This commit corrects a error in the API reference introduced in:
Ie78121d0c21d2c6033c8b5d4919e251fc4d98050.
This commit also improves the error handling to return understandable
error message, avoids print exception if the cert missed in the
file system.
Reduces the info logs from utils to prevent the dc audit dump too many
logs into the sysiv.log.
Test plan:
Passed - deploy an AIOSX, check the cert id by:
system kube-rootca-get-cert-id.
Passed - manually remove the kube-rootca cert and key from the system,
check the output of "system kube-rootca-get-cert-id", verified
the error message w/o exceptions.
Passed - verify the dc audit doesn't dump logs about the cert id in
sysinv.log.
Story: 2010852
Task: 49091
Signed-off-by: Yuxing Jiang <Yuxing.Jiang@windriver.com>
Change-Id: I47f1a9ca617bf0daf9c25e7b4552e52d3e9d1811
bc40879eca