BIND 10 #1514: Update SERIAL in DDNS

[BIND 10 Development]

#1514: Update SERIAL in DDNS
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                   Reporter:  jelte  |                 Owner:  jelte
                       Type:  task   |                Status:  reviewing
                   Priority:         |             Milestone:
  medium                             |  Sprint-20120612
                  Component:  DDNS   |            Resolution:
                   Keywords:         |             Sensitive:  0
            Defect Severity:  N/A    |           Sub-Project:  DNS
Feature Depending on Ticket:  DDNS   |  Estimated Difficulty:  4
        Add Hours to Ticket:  0      |           Total Hours:  0
                  Internal?:  0      |
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Changes (by haikuo):

 * owner:  haikuo => jelte


Comment:

 done, I polished it. I also append comments for DDNS_SOA. Make sure every
 SOAs are not none before invoke function from DDNS_SOA.

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Ticket URL: <http://bind10.isc.org/ticket/1514#comment:17>
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