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As a result of the review.

This reverts commit e5fd505f
which does not work as expected.

This now works for any identifier, instead of just MAC address.

Updated User's Guide and rename function.

The bug was manifesting itself in inability to find an existing lease
within shared network when client performed DORA without a hint.

- Commentary for one test corrected.
- Test for rapid-commit now uses a hint to make first allocation to make
  sure that the expected address is allocated.

Wrapped long lines in Makefile.am and updated default configs with a note
that configurations of other daemons are ignored.