BIND 10 #2119: cfgmgr loading of config check plugins

[BIND 10 Development]

#2119: cfgmgr loading of config check plugins
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            Reporter:  jelte         |                        Owner:
                Type:  defect        |                       Status:  new
            Priority:  medium        |                    Milestone:  New
           Component:  Unclassified  |  Tasks
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 The configmanager has a nifty feature for loading configuration check
 plugins; However, it does so by adding the plugin path to the python path,
 and then using __import__.

 Even though it puts the path at the start, I ran into a problem on one of
 my systems where it failed to load one due to a naming conflict (the up
 and coming datasrc.py), I think because a module with the same name was
 already loaded. This can be avoided by careful naming, but I think there
 is a better solution; use the imp module and its load_source() method (we
 need to make sure it is not reloaded, taken from cache, or overwrite any
 existing module)

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Ticket URL: <http://bind10.isc.org/ticket/2119>
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BIND 10 Development