BIND 10 #2963: XfroutClient::disconnect must not throw

[BIND 10 Development]

#2963: XfroutClient::disconnect must not throw
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            Reporter:  jinmei        |                        Owner:
                Type:  defect        |                       Status:  new
            Priority:  medium        |                    Milestone:  Next-
           Component:  b10-auth      |  Sprint-Proposed
            Keywords:                |                   Resolution:
           Sensitive:  0             |                 CVSS Scoring:
         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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Comment (by vorner):

 We probably should still log the error at least.

 But I think we ignore close failures in some TCP connection handling in
 the server classes too, so let's be consistent.

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Ticket URL: <https://bind10.isc.org/ticket/2963#comment:1>
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