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This function is empty now, so it needs to be implemented.

 - not used function removed
 - DHCP6_HOOK_PACKET_RCVD_SKIP message typo fixed

- callouts called using HooksManager::callCallouts
- removed Dhcp6Srv::getServerHooks() and getHooksManager() declarations.
- updated sendPacket comment (reception->transmission)
- documented getCalloutHandle()
- indentation fixed for getSubnets6()

 - pkt6_receive, subnet6_select, lease6_select, pkt6_send
 - framework updated
 - some unittests implemented

 per review comments.

and replaced use of local variable tmp in checkNakResponse.

functionaliy for conducting tests based upon a canned, preconfigured v6 subnet.
Since the new tests needed to be performed against an "empty" configuration,
I split out the common functionaliy into a base class text fixture, NakedDhcp6SvrTest,
and altered Dhcp6SvrTest to derive from it.   The new base class has no
preconfiguation.  What remains in Dhcp6SvrTest is geared soley towards tests against
a valid, canned, configuration.

The new test_fixture NakedDhcp6SrvTest is used for the following new tests:

    SolicitNoSubnet - checks response to a SOLICT w/o subnet defined
    RequestNoSubnet - checks response to a REQUEST w/o subnet defined
    RenewNoSubnet - checks response to a RENEW w/o subnet defined
    ReleaseNoSubnet - checks response to a RELEASE w/o subnet defined

The previous commit disabled unused parameter warnings in the DHCP
code  when compiling with clang.  g++ picked up some additional
warnings/errors, and this fix corrects those.

The DHCP6 server had the lease database configuration temporarily
hard-coded.  With the introduction of database configuration
parameters, that is no longer needed.

 - DORA support added
 - REQUEST/Renewing support added
 - RELEASE support added
 - AllocationEngine now supports lease4 renewals
 - many other smaller code additions
 - many tests written

- tests use automatic variables now for Dhcpv6Srv
- comments clarified
- extra log messages added