Fixed OCLogger enum log levels to be legal

Fixed OCLogger enum log levels to be legal

Double-underscores at the beginning of a token are reserved
for the compiler usage, so these values were removed.  I've also
altered the names a bit to make them look different enough so that
our users don't use them.

Finally, I made sure that they don't actually WORK, so that our
users won't be tempted to use them.

Change-Id: I3ae04ff32f01dfc6e0d89948a3b5b858157de6ab
Signed-off-by: Erich Keane <erich.keane@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/298
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Patrick Lankswert <patrick.lankswert@intel.com>