Corrected two replacments of getSignalStates() that were overlooked.

Changed the functions, getRegisteredSignals() and getSignalStates()
to instantiate static shared pointers and return these, rather than
raw pointers to statically declared containers.

Added private shared pointer members to SignalSet, registered_signals_
and signal_states_.  These are initialized within SignalSet constructors
by calling the functions getRegisteredSignals() and getSignalStates()
respectively.  This ensures that both static lists remain inscope until
all SignalSets have been destroyed.

Replaced use of getRegisteredSignals() and getSignalStates() with
new private members, registered_signals_ and signal_states_.

Removed work-around code in src/bin/d2/d_controller.cc put in place
until this ticket was resolved.

Agreed on this change on Jabber.

The former replaces the -v with the -d parameter in D2 unit tests. This
enables the D2 tests that were skipped when the -v parameter was in use.
The -v causes D2 to print version number and exits. The other patch is
for printing configuration summary in D2 which we were not aware was failing
because tests used to be skipped with -v parameter.

This was also suggested in the review.

 - It's called getMACFromIPv6() now
 - Tests for u,g bits added.
 - u bit is now flipped properly.
 - Unit tests updated to reflect above changes.