[M120 Migration][VD] Add some debug log

[M120 Migration][VD] Add some debug log

1. Add debug log for invalid key and value of SetHeader.
2. Add Navigation debug info in main process.
3. Modify log content for resource_error.cc.
4. Add debug info for Navigation loading process and progress change.
5. Add log to print pid of child processes

Reference:
 - https://review.tizen.org/gerrit/292064/
 - https://review.tizen.org/gerrit/291154/
 - https://review.tizen.org/gerrit/293831/

Change-Id: I5a9e8bd1d287c256f0ab8d1df7b42e8e94f3bb60
Signed-off-by: jiangyuwei <yuwei.jiang@samsung.com>