MAX_URI_LENGTH was being redefined at multiple places

MAX_URI_LENGTH was being redefined at multiple places

MAX_URI_LENGTH was redefined at multiple places. It is defined in
ocstackconfig.h and should not be redefined at other places. Please
note this was only done in the sample code.

https://jira.iotivity.org/browse/IOT-1218

Change-Id: I334f028779f202a4371a1409d4e3ce69cd40d121
Signed-off-by: Habib Virji <habib.virji@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/11153
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Ziran Sun <ziran.sun@samsung.com>