BIND 10 #2930: Sending notifications over msgq

[BIND 10 Development]

#2930: Sending notifications over msgq
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                   Reporter:         |                 Owner:
  vorner                             |                Status:  new
                       Type:  task   |             Milestone:  Next-Sprint-
                   Priority:         |  Proposed
  medium                             |              Keywords:
                  Component:         |             Sensitive:  0
  Inter-module communication         |           Sub-Project:  Core
               CVSS Scoring:         |  Estimated Difficulty:  0
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:         |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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 This is part of #1925.

 This task is to create function `createNotification(name, params)` and
 module CC session's method `sendNotification(notificationGroup, name,
 params)`.

 The `createNotification` would be similar to `createCommand` or similar
 functions and would produce something like:

 {{{
 {
     "notification": ["<name of the notification>", <params>]
 }
 }}}

 The `sendNotification` would call the `createNotification` function and
 send it to a group `Notifications/<notificationGroup>` (the prefix is
 there so we wouldn't collide with other group names).

 As this is rather small and simple task, this should cover both python and
 C++ versions of the library.

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Ticket URL: <https://bind10.isc.org/ticket/2930>
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