Modify related topiclist.

Modify related topiclist.

first patch included
1. Rename function and variables related TopicList.
2. Destory TopicList.

second patch inlcuded
remove the white spaces.

third pacth included
remove duplicated initTopiList.

four patch updated commit message only.

Change-Id: Id13c4442546c0659eb4f8c73a4f2a7fc832d330e
Signed-off-by: jaesick.shin <jaesick.shin@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/10205
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Madan Lanka <lanka.madan@samsung.com>