GitLab

 - Daemon::getVersion() added
 - exists => exits in docs
 - fixed comment in dhcp_test_lib.sh.in

Starting lease manager in the server constructor implied the use of the
default memfile for a short period until the server is configured. The
default memfile configuration used the persistence (writing leases to disk)
which in many cases required root privileges. This caused some unit tests
to fail.

Testing undercovered a missing log place holder in Dhcp4_srv.cc, which
surfaces when a release for a non-existance lease is received.
This has been corrected.

Updated Dhcpv4Srv to use D2ClientMgr::getUpdateDirections method and
adjusted FQDN unit tests to accomodate new client delegation behavior.

Modified Dhcpv4Srv to handle DHO_HOST_NAME as an OptionString
rather than an OptionCustom.

Dhcpv4Srv now sends NameChangeRequests to D2ClientMgr rather than posting
them to an internal queue.  At this point, b10-dhcp4 should generate requests
and ship them to b10-dhcp-ddns when configured appropriately.

Server now starts D2ClientMgr send mode after configuration if updates are
enabled, and provides an error handler to intervene if D2 communications fail.
Added new unitests in d2_unittest.h and .cc.

Most notable change is the removeal of the remove-on-renew
configuration parameter.  Other changes were to commentary
or minor code improvements.

Also, moved lease unit tests to a dedicated test file.

Replaced hard-coded constants in dhcp4_srv.cc with methods and
logic in D2ClientMgr to implement behavior changes based on
dhcp-ddns configuration values.

 - Dhcpv{4,6}Srv::classifyPacket() is now better commented.
 - constants are now used instead of magic numbers
 - Pkt{4,6}::addClass is now better commented