This patch provides the rest API needed to
get settings that allow conditionally
displaying the volume device name
and admin password.
Examples:
settingsService.ifEnabled('setting').then(doThis);
settingsService.ifEnabled('setting', 'expected', 'default').then(doThis, elseThis);
Change-Id: I8d16f4b974786157c5aa562e2675e6e60aabc412
Partial-Bug: #1439906
Partial-Bug: #1439905