BIND 10 #1940: document bindctl execute commands

[BIND 10 Development]

#1940: document bindctl execute commands
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            Reporter:  jelte         |                        Owner:
                Type:  task          |                       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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 There is internal documentation on the command (and the directives it
 handles from its input file/data), but I forgot to include external docs
 (guide, manpage).

 Needs to describe:
 - the command itself
 - the various built-in commands (currently there is just one)
 - the file

 and input format;
 - lines are simply commands
 - directives (!verbose, !echo and #comments)

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Ticket URL: <http://bind10.isc.org/ticket/1940>
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