Update malware and permission checks, more backup config info

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UPDATED - The BG Botnet malware has changed.  Added some additional files to check.

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FIXED - Uninitialized value warning in the CDorked malware check due to a race-condition which was exposed by the use of the ITK MPM on a heavily loaded server.

Credit:
  Mary Wior

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UPDATED - Add 4711 as an acceptable permission value for /usr/bin/crontab.

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UPDATED - Add /etc/localdomains to non-default file permission checks.  Apparently if /etc/localdomains is actually readable by normal users it can cause problems when adding Forwarders.  Case pending.

[WARN] * Non-default Permissions: /etc/localdomains (mode: 0644 | default: 0640) - Failing to properly create an email forwarder? See ticket 5234627.

Credit:
  Kyle Pinkley

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UPDATED - Add /etc/exim.conf to immutable files check.

Credit:
  Kyle Pinkley

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UPDATED - Print additional backup system info, such as if account backups are enabled or disabled, and what type it is.  Also, it previously would detect if a backup cron job was entirely missing, but now also detects if the job is commented-out.


[INFO] * Backups: [New: Enabled/WithAccounts/Compressed] [Legacy: Enabled/NoAccounts/Incremental (MISSING CRON!)]


Credit:
  Peter Elsner (for the part about additional info)

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