Modify for Related Topic.

Modify for Related Topic.

this patch included
1. bug fixes for invalid type and mutex unlock logic.
2. Add NSProviderDeleteConsumerTopic Function. This function is called when you deselect topic.
3. delete NSIsTopicSubscribed function. This function is not required.

Change-Id: I2629418f441ad0efaaee864b22150424158fa43c
Signed-off-by: jaesick.shin <jaesick.shin@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/10645
Reviewed-by: Chihyun Cho <ch79.cho@samsung.com>
Reviewed-by: Uze Choi <uzchoi@samsung.com>
Tested-by: Uze Choi <uzchoi@samsung.com>