TestFunctional/Mounting fails with 1.0 image: stat: cannot stat '/mount-9p/fromhost': Permission denied

[tstromberg]

 13:35:32 | > Running
=== RUN   TestFunctional/Mounting
=== PAUSE TestFunctional/Mounting
=== CONT  TestFunctional/Mounting
 13:35:36 | SSH: stat /mount-9p/fromhost
 13:35:36 | Output: stat: cannot stat '/mount-9p/fromhost': Permission denied
ssh: Process exited with status 1

panic: Unable to stat fromhost via SSH. error exit status 1, stat: cannot stat '/mount-9p/fromhost': Permission denied
ssh: Process exited with status 1
 [recovered]
        panic: Unable to stat fromhost via SSH. error exit status 1, stat: cannot stat '/mount-9p/fromhost': Permission denied
ssh: Process exited with status 1

The root cause appears to be that the removal of the rkt user has changed the Docker uid from 1001 to 1000.