Reformat the resource/csdk SConscripts to be more Pythonic 1/4

Reformat the resource/csdk SConscripts to be more Pythonic 1/4

This is now part 1 of 4, containing the sconscripts not
in connectivity, stack or security (see other three parts for those)

There are not intended to be any functional changes.

In a couple of places, for general consistency, changed
  SConscript('#foo') to SConscript('#/foo') - these are equivalent
"help vars" assignments formatted so messages can be improved later
  without changing formatting
all EnumVariable usage now calls out allowed_values= to be more clear

The test harness is now consistently imported as:
  from tools.scons.RunTest import run_test
rather than import * - should normally avoid importing whole
namespace unqualified unless it is really needed

The test harness is now consistently imported as:
  from tools.scons.RunTest import run_test
rather than import * - should normally avoid importing whole
namespace unqualified unless it is really needed

Change-Id: I3f818ef972a9c84f9d0aec27348ec6da07f49e02
Signed-off-by: Mats Wichmann <mats@linux.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/20817
Tested-by: jenkins-iotivity <jenkins@iotivity.org>
Reviewed-by: C.J. Collier <cjcollier@linuxfoundation.org>