Explicitly specify OCResourceIdentifier assignments/ctors

Explicitly specify OCResourceIdentifier assignments/ctors

The OCResourceIdentifier proxy class depends on compiler rules
to determine validity of constructors and assignments.  This patch
correctly explicitly specifies these values.

Note: This patch does NOT change any behavior or functionality, it
solely specifies behavior explicitly rather than implicitly.

Change-Id: I5110cb10e07112e7786c56fedee43f76cfdab3bd
Signed-off-by: Erich Keane <erich.keane@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/572
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Sudarshan Prasad <sudarshan.prasad@intel.com>