BIND 10 #2578: add "-q" (quite) option to b10-loadzone

[BIND 10 Development]

#2578: add "-q" (quite) option to b10-loadzone
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                   Reporter:         |                 Owner:
  jinmei                             |                Status:  new
                       Type:  task   |             Milestone:  New Tasks
                   Priority:         |              Keywords:
  medium                             |             Sensitive:  0
                  Component:         |           Sub-Project:  DNS
  loadzone                           |  Estimated Difficulty:  0
               CVSS Scoring:         |           Total Hours:  0
            Defect Severity:  N/A    |
Feature Depending on Ticket:         |
  loadzone-ng                        |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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 As discussed in review of #2380.  It's probably useful if the user
 can suppress info level (or maybe even any level of) logging from
 b10-loadzone, e.g, when it's invoked from a cron.

 My suggestion is:

 - Add -q option, which disables info level logs; if specified multiple
   times it suppress any level of logs
 - (optionally) add "-l" option, which specifies the output of log
   messages.

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Ticket URL: <http://bind10.isc.org/ticket/2578>
BIND 10 Development <http://bind10.isc.org>
BIND 10 Development