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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.

 - general improvements in AllocEngine
 - doc updated

Add the write method to lease_file_loader to dump the leaes files
from a storage container into a file.

Update the LFC code to use the lease_file_loader functions to
load the leases from the appropriate files and then to write
them to the output file and finally to move the file around.

After we have completed writing the lease file and moved it to finish
we need to delete the previous and copy files if they exist and move
the finish file to previous.

Conflicts:
	ChangeLog

Add PIDFile class to write, delete and check PID files.

Use the PIDFile class in the LFC process to ensure that
only one LFC is running at a time.

Update the PIDFile test code to create the file for the
not writable test.

Add entry in ChangeLog

Passing the std::string doesn't work on Linux. For some reason it works
on BSD.

PIDFile::write closes the stream before throwing an exception. Also,
remove the TESTNAME2 file before and after the test.