Indicate intentional fall through in switch statments

Indicate intentional fall through in switch statments

Add comments to clearly indicate that these cases that lack
a `break` statement is intentional

The lack of `break` statment shows up in many analysis tools.
Adding the comments helps when evaluating reports from analysis
tools.

Change-Id: I24f0e4ee7b8d651bed6a8a0f8179d0ec789521a4
Signed-off-by: George Nash <george.nash@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/15239
Reviewed-by: Dave Thaler <dthaler@microsoft.com>
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Dan Mihai <Daniel.Mihai@microsoft.com>
Reviewed-by: Greg Zaverucha <gregz@microsoft.com>
Reviewed-by: Habib Virji <habib.virji@samsung.com>
Reviewed-by: Kevin Kane <kkane@microsoft.com>