add helper functions to remotes

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
make util be aware of OSD paths

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
tests for figuring out the mount point

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
implement osd list

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>