BIND 10 #2043: Fix remaining Python warnings about unclosed files and sockets

[BIND 10 Development]

#2043: Fix remaining Python warnings about unclosed files and sockets
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                   Reporter:  muks          |                 Owner:
                       Type:  defect        |                Status:  new
                   Priority:  low           |             Milestone:
                  Component:  Unclassified  |            Resolution:
                   Keywords:                |             Sensitive:  0
            Defect Severity:  N/A           |           Sub-Project:  DNS
Feature Depending on Ticket:                |  Estimated Difficulty:  6
        Add Hours to Ticket:  0             |           Total Hours:  0
                  Internal?:  0             |
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Comment (by stephen):

 Some information on one of these unclosed files/sockets can be found in
 #2410.

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Ticket URL: <http://bind10.isc.org/ticket/2043#comment:3>
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