Add generic API for setting and getting defined tag values

Add generic API for setting and getting defined tag values

- Uses the resource attribute of OCResource for storing and retrieving device and platform values.
- Removed global savedDeviceInfo and savedPlatformInfo. The information passed via
OCSetDeviceInfo and OCSetPlatformInfo is stored in rsrcAttributes.
- OCAttribute type change from char * to void * to store generic value, this was part of OCResource but was not used.
- Payload type PAYLOAD_TYPE_DEVICE and PAYLOAD_TYPE_PLATFORM is removed from PAYLOAD_TYPE as this was used only internally.
- Payload convert and parse for payload type device and platform is removed, as device and payload uri uses
OCRepresentation payload type.
- Delete function to delete resource attributes.
- OCDevicePayloadCreate and OCPlatformCreate is removed as this was only used internally, all values are now stored in
resource attributes.
- Moves OCSetDeviceInfo and OCSetPlatformInfo from ocstack to ocresource to avoid duplicate checking.
- Add set and get API to set parameter for /oic/d and /oic/p.
- OCGetResourceHandleAtUri accesible without ifdef RD_CLIENT.
- Updated Unit test to test the functionality.
- Add the OCSSetParam and OCGetParam in C++ and Java

Change-Id: If822ae95a70e681121528679de8da1375718de0c
Signed-off-by: Habib Virji <habib.virji@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/14377
Reviewed-by: Uze Choi <uzchoi@samsung.com>
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>