BIND 10 #1987: 'wait for' command in bindctl execute handling (or something similar)

[BIND 10 Development]

#1987: 'wait for' command in bindctl execute handling (or something similar)
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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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 As pointed out on bind10-users
 (https://lists.isc.org/pipermail/bind10-users/2012-May/000339.html), the
 execute command has a limitation (which is partially called by not
 supporting commands/configuration for non-running moduels);

 it is not possible to start a module and immediately configure it, since
 the module is just started, it is not known by bindctl yet, so
 configuration and commands to said module would result in a 'Module
 Unknown' error.

 The proposed solution is to add a !wait for <module> [time] command, which
 would call
 self.__update_all_modules() (we currently have no more efficient update
 mechanism), and then check if the module that is waited for has appeared
 yet.
 The optional time argument would give a timeout, at which point execute
 should just give up.

 If we have this as a command, we should consider adding 'config commit' to
 init_auth_server, and then call that new command for each module
 init_auth_server starts, so that anyone who includes init_auth_server in
 other scripts can be assured that the new modules are running afterwards.

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Ticket URL: <http://bind10.isc.org/ticket/1987>
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