BIND 10 #2505: add "module_description" into spec files of Xfrout, Zonemgr, and DDNS

[BIND 10 Development]

#2505: add "module_description" into spec files of Xfrout, Zonemgr, and DDNS
-------------------------------------+-------------------------------------
            Reporter:  naokikambe    |                        Owner:
                Type:  defect        |                       Status:  new
            Priority:  low           |                    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 no "module_description" in spec files of Xfrout, Zonemgr, and
 DDNS. Add descriptions for them. The current output of the help command in
 bindctl is:
 {{{
 > help
 ..
 Available module names:
     help        Get help for bindctl.
     config      Configuration commands.
     execute     Execute a given set of commands
     Stats       Stats daemon
     Cmdctl      Interface for command and control
     data_sources
             The sources of authoritative DNS data
     tsig_keys   The TSIG keyring is stored here
     Boss        Master process
     Logging     Logging options
     Xfrin       XFR in daemon
     Auth        Authoritative service
     Xfrout
     Zonemgr
     DDNS
     StatsHttpd  Stats HTTP daemon
 >
 }}}

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Ticket URL: <http://bind10.isc.org/ticket/2505>
BIND 10 Development <http://bind10.isc.org>
BIND 10 Development