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:  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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 File and socket objects must be explicitly closed with `.close()` when
 done using them, otherwise they generate warnings (and depending on the
 interpreter, may be destroyed much later than expected, keeping the
 underlying fd alive).

 As part of bug #1828, we fixed many of these warnings. There are still a
 few non-obvious ones left. There are also some which have been introduced
 since the time when the trac1828 branch was created.

 This is a new bug to fix those issues.

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Ticket URL: <https://bind10.isc.org/ticket/2043>
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