BIND 10 #944: some generalized checks

[BIND 10 Development]

#944: some generalized checks
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            Reporter:  jelte         |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  major         |                    Milestone:  New
           Component:  Unclassified  |  Tasks
           Sensitive:  0             |                     Keywords:
         Sub-Project:  Core          |              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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 we don't really have a python util afaik, but we could use some general
 set of checks (for instance that an integer is a valid port number, that a
 string represent a valid domain name, etc.); from #811:

 "this makes me think that maybe we do need a set of generalized check-
 calls like is_valid_port_number, etc. Preferably ones that do not raise,
 but do convert to specific type if necessary (and do provide the error if
 they can't)"

 having a good place to put these and a somewhat general interface for this
 is more important than providing a complete set of specific checks, we can
 add them as we encounter the need for them later

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Ticket URL: <http://bind10.isc.org/ticket/944>
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