soft-sensor-manager: Fix cppcheck errors

soft-sensor-manager: Fix cppcheck errors

This patch fixes the errors reported by cppcheck tool for
'(error) Mismatching allocation and deallocation: avg'.
Replaced delete with delete[] wherever the memory is allocated
using new [].

Change-Id: Ic32755347ad24aeb2a1c57341249038fd511073a
Signed-off-by: Ravi Nanjundappa <nravi.n@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/2067
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Jon A. Cruz <jonc@osg.samsung.com>
Reviewed-by: Erich Keane <erich.keane@intel.com>
Reviewed-by: Uze Choi <uzchoi@samsung.com>