Swift configuration parameter audit

This change is the result of an audit through the config parameters
provided by swift and how/if they are addressed in the swift
documentation. The documentation being the sample config files in
the /etc directory or the documentation.

This change is only concerned with the config files in etc/ next
I will look at the documentation in the doc/ folder.

This change makes the following assumptions:
  - Unless stated otherwise, the commented out parameter in the
    sample configuration is the default for swift.

  - When the default in the code differs from that of the sample
    configuration, the default in the code is correct.

Container reconciler:
  Parameter: interval
    - code: 30
    - config: 300
  Result: config = 30

Object Expirer:
  Parameter: recon_cache_path
    - code: /var/cache/swift
    - config: Parameter missing
  Result: Add parameter

swift-dispersion-populate && swift-dispersion-report
  Parameter: auth_version
    - code: 1.0
    - config: 2.0 (due to being a confusing example of how to setup
                   version 2.0).
  Result: Added 'auth_version = 1.0' to the right section (showing
          default and make the sample configuration for auth version
          2.0 easier to understand.

swift-drive-audit:
  Parameter: log_file_pattern
    - code: /var/log/kern.*[!.][!g][!z]
    - config: /var/log/kern*
  Result: config = /var/log/kern.*[!.][!g][!z]

  NOTE: swift-drive-audit uses a parameter called device_dir which
        defaults to '/srv/node'. In all other swift binaries/services
        there is a similar parameter called devices which stores the
        same thing. This is an inconsistency which I haven't fixed
        as this could break existing swift clusters out in the wild.

Proxy Server:
  Parameter: object_chunk_size
    - code: 65536
    - config: 8192
  Result: config = 65536

  Parameter: client_chunk_size
    - code: 65536
    - config: 8192
  Result: config = 65536

  Parameter: strict_cors_mode
    - code: True
    - config: No parameter
  Result: config = True

Account and Container replicator configuration confusion:
  NOTES:
    The account and container replicators have parameters:
      - interval
      - run_pause

    Both of these are loaded into the same variable in code:
      self.interval = int(conf.get('interval') or
                          conf.get('run_pause') or 30)

    If a user sets both to different values then interval is used.
  Result: Update the configuration to make this more clear.

DocImpact
Change-Id: Iaadbb1a6284f8b3e0801bc343b29772f70f4bf6e
Merge "Swift configuration parameter audit"