Added commits for all tickets implementing kea-lfc. Also, corrected the
LRC design url. Commiting on my discretion.

This branch adds the main processing functions for
lease file cleanup.  We added

code in lease_file_loader.h to write leases from storage to a file

code in lfc_controller to read leaes into storage from a file
and then write the storage out to a file (using lease_file_loader)
and then to move the files around to get the names correct.

Conflicts:
	ChangeLog

Conflicts:
	src/lib/dhcpsrv/alloc_engine.cc

 - if-else clauses in allocateLeases6
 - allocateUnreservedLeases6 uses for instead of do loop

One of the large items was to rearrange the
lfc_controller test code to:
- not use .c_str()
- check the non-existance of the temporary files after processing
- remove any files after each subtest
- Use a_1 instead of A_1 for variable names

There were also some other coding standards issues as well
as additional comments and such.

 - Dhcp6Client::oro_ is now private
 - Dhcp6Srv::copyDefaultOptions renamed to copyClientOptions
 - Comment in processInfRequest clarified

Add more tests to verity the cleanup of leases files

Cleanup the code for comments, typos, spaces and the like.

Replaced the do-while loop with the for loop in the allocateLease4. Also,
updated the copyright date.