[4481] Made query4 and query6 callout arguments uniformly available

[4481] Made query4 and query6 callout arguments uniformly available

The client packet is now uniformly available to all client packet driven
callouts for both v4 and v6:

Added "query4" to lease4_select and lease4_renew
    src/bin/dhcp4/dhcp4_hooks.dox
        Added query4 argument to lease4_select and lease4_renew documentation

    src/bin/dhcp4/tests/hooks_unittest.cc
        Revamped to track both query4 and response4 arguments
        TEST_F(HooksDhcpv4SrvTest, lease4RenewSimple) - modified to verify
        query4 set by lease4_renew callout

    src/lib/dhcpsrv/alloc_engine.cc
        - AllocEngine::createLease4()
        - AllocEngine::reuseExpiredLease4() - modified to add query4 to
        lease4_select callout arguments
        - AllocEngine::renewLease4() - modified to add query4 to lease4_renew
        callout arguments

    src/lib/dhcpsrv/tests/alloc_engine_hooks_unittest.cc
        HookAllocEngine4Test() - modified to track query4 argument
        TEST_F(HookAllocEngine4Test, lease4_select) - modified to verify query4
        callout argument

Added "query6" to pkt6_send and lease6_select
    src/bin/dhcp6/dhcp6_hooks.dox
        Added query6 argument to pkt6_send and lease6_select documentation

    src/bin/dhcp6/dhcp6_srv.cc
        Dhcpv6Srv::processPacket(Pkt6Ptr& query, Pkt6Ptr& rsp) - modified to
        add query6 to the pkt_send callout arguments

    src/bin/dhcp6/tests/hooks_unittest.cc
        Revamped to track both query4 and response4 arguments
        TEST_F(HooksDhcpv6SrvTest, simplePkt6Send) - modified to
        verify query6 set by pkt6_send callout

    src/lib/dhcpsrv/alloc_engine.cc
        - AllocEngine::createLease4()
        - AllocEngine::reuseExpiredLease6() - modified to add query6 to
        lease6_select callout arguments
        callout arguments

    src/lib/dhcpsrv/tests/alloc_engine_hooks_unittest.cc
        HookAllocEngine6Test() - modified to track query6 argument
        TEST_F(HookAllocEngine6Test, lease4_select) - modified to verify
        query6 argument