ceph-disk: add missing space after comma

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>
ceph-disk: fix Redefining name 'uuid' from outer scope

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>
ceph-disk: define exception type

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>
ceph-disk: merge twice defined function is_mounted(dev)

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>
ceph-disk: fix naming of local variable in is_mounted()

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>
ceph-disk: fix some (local) variable names

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>
Merge pull request #186 from dalgaaf/wip-da-pylint

Fix smaller python issues