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 - check for address being :: updated

Presented rate is now the number of ACK/Reply messages,
rather than DO/SA.

The extended test verifies that the stats manager is
still usable after some packets have been collected.

When the perfdhcp performs unordered packet lookup within
a bucket of sent packets, it will remove all timed out
transactions.

This is to eliminate some of the recently found covertity isssues.
Reviewed on jabber.

 - returnining different values in callout_params_library.cc
 - returned values are now described for getParameter
 - corrected index syntax comment in getParameter
 - added missing include
 - hooks_user.dox updated
 - hooks unit test moved, so it is now next to other hooks tests

- No additional check for HR mode in findReservations
- Additional commentary in the loop collecting host ids.

    Merges in trac4239.

This change was suggested during a ticket review.

src/lib/dhcpsrv/pgsql_lease_mgr.cc
    Amended commentary for getColumnValue() variants
    Added decription of Uiaid union
    Changed std::system to ::system

src/lib/dhcpsrv/testutils/mysql_schema.cc
    Changed std::system to ::system

src/lib/dhcpsrv/testutils/mysql_schema.h
    Fixed typo

src/lib/dhcpsrv/testutils/pgsql_schema.cc
    Removed extraneous include
    Changed std::system to ::system

Both DHCPv4 and DHCPv6.

The identifiers are held on an ordered list and the server will
use them to search for host reservations for each client using
this order.