BIND 10 #1443: allow bind10 to run even if configuration is corrupted

[BIND 10 Development]

#1443: allow bind10 to run even if configuration is corrupted
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                   Reporter:  jreed  |                 Owner:  UnAssigned
                       Type:         |                Status:  reviewing
  defect                             |             Milestone:
                   Priority:         |  Sprint-20120403
  medium                             |            Resolution:
                  Component:         |             Sensitive:  0
  configuration                      |           Sub-Project:  Core
                   Keywords:         |  Estimated Difficulty:  4
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:         |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Changes (by jelte):

 * owner:  jelte => UnAssigned
 * status:  assigned => reviewing


Comment:

 Ready for review, first commit is a bit of functional helper; a method to
 back up the current file (if it exists) and the logging of said action.
 Second commit is the bind10 command-line argument (which passes it on to
 b10-cfgmgr)

 btw, given the functionality, IMO --recover wasn't really correct, so I
 called it --clear-config

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Ticket URL: <http://bind10.isc.org/ticket/1443#comment:9>
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