CVE-2018-1088,glusterfs: Wheezy is not affected

The glusterfs_shared_storage option was added in 2015 which was after the
release of Debian's version of glusterfs in Wheezy. The vulnerable code to
create and mount a shared volume is not present.

https://github.com/gluster/glusterfs/commit/402589f58cbb350dfedafa83e133664855ed37b2#diff-21659a7d9d296e24dbc868d98ef7a234