gk-deploy: Change container directory of heketi-storage.json
gk-deploy: Change container directory of heketi-storage.json

If the image is more securely configured, heketi-cli doesn't have write
permissions to the root of the filesystem of the container. Changed the
output location to /tmp.

Signed-off-by: Jose A. Rivera <2a0958b6fecb909a38a254361e8d9708c4487d67@redhat.com>

gluster/gluster-kubernetes,gluster/gluster-kubernetes