BIND 10 #1079: bindctl 'config add <item>' should be a bit more lenient

[BIND 10 Development]

#1079: bindctl 'config add <item>' should be a bit more lenient
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            Reporter:  jelte         |                        Owner:
                Type:  defect        |                       Status:  new
            Priority:  major         |                    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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 'config add' takes a list and a value to add to the list, and the value is
 optional; if left out it'll add an item with only defaults

 It should be a bit more lenient; 'config add foo/bar[index]' should also
 work, possibly checking if 'index' is indeed the next available index.
 This currently fails with a cryptic error message.

 There is a second problem that 'config add' does not work twice in a row
 (only if you commit in between)

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Ticket URL: <http://bind10.isc.org/ticket/1079>
BIND 10 Development <http://bind10.isc.org>
BIND 10 Development