BIND 10 #1522: Implementatio of isc::server_common::SocketRequestor

[BIND 10 Development]

#1522: Implementatio of isc::server_common::SocketRequestor
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            Reporter:  vorner        |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  blocker       |                    Milestone:
           Component:  Unclassified  |  Sprint-20120110
           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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 This is task split of #805. The commit
 c8caecc35195080d091611bb0809cbc2834ba3f4 (on the trac805 branch)
 introduces an interface of the SocketRequestor. That is supposed to
 actually get the socket over the wire from the boss.

 The plan is to implement a concrete class implementing the methods. The
 tests may even subclass this concrete class (the tests might even want to
 subclass this concrete class to mock the communication over the unix
 domain socket).

 The requestSocket would be blocking, it would send the request over the CC
 session, wait for the answer, check if the unix domain socket is already
 connected, if not, connect, and pick up the socket over it.

 The releaseSocket would just send the request over the CC session and wait
 for the answer (so the answer is picked up and isn't stuck there forever).

 The SocketRequestor::init function should be implemented in this task as
 well.

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Ticket URL: <http://bind10.isc.org/ticket/1522>
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