[Bug 1811098] Fix proposed to ceilometer (stable/queens)

[OpenStack Infra]

Fix proposed to branch: stable/queens
Review: https://review.openstack.org/630366

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https://bugs.launchpad.net/bugs/1811098

Title:
  ceilometer writing snmp credentials to log file

Status in Ceilometer:
  In Progress
Status in Ubuntu Cloud Archive:
  New

Bug description:
  The ceilometer-agent-central is always writing the contents of
  polling.yaml to its log file (and as INFO) [1]

  This presents a security risk if e.g. resources contain sensitive
  information like when specifying snmp targets with the url containing
  the username, password etc.

  There are a couple of ways we could solve this, namely; (1) don't log
  this info at all, (2) sanitise the contents prior to logging as DEBUG
  (3) switch to using config for the snmp credentials in a similar way
  to how the Triple0Discoverer does it [2] - this would only support
  having the same creds everywhere thought which may not be desirable.

  [1] https://github.com/openstack/ceilometer/blob/stable/rocky/ceilometer/agent.py#L70
  [2] https://github.com/openstack/ceilometer/blob/stable/rocky/ceilometer/hardware/discovery.py#L24

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