At present, `auto_unmount` option is recorded at PV annotation of glusterfs PV. Due to the preference given in MountOptionFromSpec() for annotation mount options over sc supplied mount options(Ref PR# https://github.com/kubernetes/kubernetes/pull/66576), the sc supplied mount options are not honoured in glusterfs plugin eventhough the driver returns `true` for storage class mountoptions support at probe. This patch removes `auto_unmount` option from annotation of the pv spec. Signed-off-by: Humble Chirammal <hchiramm@redhat.com>