BIND 10 #2222: Implement counters into Xfrout (2/3)

[BIND 10 Development]

#2222: Implement counters into Xfrout (2/3)
-------------------------------------+-------------------------------------
            Reporter:  naokikambe    |                        Owner:
                Type:  enhancement   |  naokikambe
            Priority:  medium        |                       Status:  new
           Component:  xfrout        |                    Milestone:  New
           Sensitive:  0             |  Tasks
         Sub-Project:  DNS           |                     Keywords:
Estimated Difficulty:  0             |              Defect Severity:  N/A
         Total Hours:  0             |  Feature Depending on Ticket:
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 According to StatisticsItems, implement the following statistics items to
 Xfrout like #2158.

 ||'''Module'''||'''Item'''||'''in BIND 9 Statistics XML (tree
 representation under isc/bind/statistics)'''||'''Description from BIND 9
 Manual'''||'''Implemented in BIND 10?'''||
 ||Xfrout|| || || || ||
 || ||xfrout.ixfr_running||(shown in 'rndc status': xfers running)||Number
 of IXFRs in progress||no||
 || ||xfrout.axfr_running||(shown in 'rndc status': xfers running)||Number
 of AXFRs in progress||no||

 The classes to be revised are: !XfroutServer, !XfroutCounter(introduced in
 #2158), !XfroutSession. The related unittest and the lettuce test should
 be also revised. This ticket depends on #2158. Most of fundamental
 implementation has been done in #2154, so this ticket would not be so
 difficult.

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Ticket URL: <http://bind10.isc.org/ticket/2222>
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