feedback: Exclude codes from line coverage

feedback: Exclude codes from line coverage

Code that is not covered by test code is excluded.
If the code is only for internal API, it is also omitted.
Also, sound-parser.c will be removed and merged into feedback-config.c later.
feedback-config function is excluded because currently it is not used anywhere.
As such, functions that will undergo major structural changes have also been excluded.

Change-Id: I39581b5ce29b5af015e73487fcd2b1854e7d16c2
Signed-off-by: Yunhee Seo <yuni.seo@samsung.com>