Add button to trust a CA cert

- Put Disable button for system cert and Remove button for user cert as action button in cert dialog
- OK (dismiss) button is displayed when trust button is not shown
- Showing chain of cert dialot will be in a later CL

Bug: 18224038
Change-Id: Ieef70e12fd8bdf711be48dc0488f03dbe143d3c5
2 files changed