cephfs: trim spaces around fuseMountOptions
cephfs: trim spaces around fuseMountOptions

When passing

    fuseMountOptions: debug

in the StorageClass, the mount options passed on the ceph-fuse
commandline result in "-o nonempty ,debug". The additional space before
the ",debug" causes the mount command to fail.

Fixes: 1485
Signed-off-by: Niels de Vos <7bda0c0ee7f47171cc808e9e60292cbc5d8140dd@redhat.com>

ceph/ceph-csi,ceph/ceph-csi,ceph/ceph-csi,ceph/ceph-csi