dist/common/scripts/scylla_fstrim: don't abort the program when a disk doesn't support TRIM
dist/common/scripts/scylla_fstrim: don't abort the program when a disk doesn't support TRIM

Do not abort the program until run fstrim on all directories.

Fixes #2220

Signed-off-by: Takuya ASADA <4ebfb6f510af412d6e89fefa3ab96d9c8b5e3fff@scylladb.com>
Message-Id: <1490595397-19130-1-git-send-email-4ebfb6f510af412d6e89fefa3ab96d9c8b5e3fff@scylladb.com>

avikivity/scylla,scylladb/scylla,duarten/scylla,scylladb/scylla,avikivity/scylla,scylladb/scylla,duarten/scylla,duarten/scylla,avikivity/scylla,scylladb/scylla