Add sanity tests for file path access with FUSE

Also add to TEST_MAPPING.
The test assumes FUSE is running, so it won't break presubmits.
(Well, unless FuseDaemon is broken)

Test: atest FuseDaemonTest
Bug: 142926859
Change-Id: I882f11c226b6d360d7ff1cecac46c26db25ddca2
5 files changed