BIND 10 #2306: document new bindctl execute command

[BIND 10 Development]

#2306: document new bindctl execute command
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            Reporter:  jreed         |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  medium        |                    Milestone:  New
           Component:                |  Tasks
  documentation                      |                     Keywords:
           Sensitive:  0             |              Defect Severity:  N/A
         Sub-Project:  Core          |  Feature Depending on Ticket:
Estimated Difficulty:  0             |          Add Hours to Ticket:  0
         Total Hours:  0             |                    Internal?:  0
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 Add section to guide about using "execute" command.  This could be part of
 the #2305 bindctl documentation.

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Ticket URL: <http://bind10.isc.org/ticket/2306>
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BIND 10 Development