BIND 10 #3325: Add wrapper for asio::io_service::poll and poll_one to asiolink::IOService

[BIND 10 Development]

#3325: Add wrapper for asio::io_service::poll and poll_one to asiolink::IOService
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                   Reporter:  tmark  |                 Owner:  UnAssigned
                       Type:         |                Status:  new
  enhancement                        |             Milestone:  New Tasks
                   Priority:  low    |              Keywords:
                  Component:         |             Sensitive:  0
  libdns++                           |           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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 asio::io_service provides two non-blocking methods, poll and poll_one for
 executing ready handlers.  These methods are not currently visible as
 there are no wrappers provided in asiolink::IOService.

 b10-dhcp-ddns related and related Kea work make use of poll now by
 accessing the native io_service.

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Ticket URL: <http://bind10.isc.org/ticket/3325>
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