This fix was reviewed and approved on Jabber.

Conflicts:
	src/lib/dhcpsrv/memfile_lease_mgr.cc
	src/lib/dhcpsrv/memfile_lease_mgr.h

- Pass io_service to D2Process as a const reference
- Fix issues in memfile unittest

Also, corrected the whitespaces in the preceding entry.

This change is a result of the review.

Also fixed whitespaces in some recent entries.

This patch has been proposed by Alexis Fidalgo. It was earlier reported
that Kea always appends a dot at the end of the hostname which may cause
some clients to fail on processing this option.

Simplified the method which loads leases from the CSV file.

- copyright year updated
- comment clarified
- added @todo in Pkt::setHWAddrMember()
- getMACfromDocsis*() don't use intermediate members, will accept
  options with length 1

Also, prevented opening the optional lease files if they don't exist.