glfs: Discontinue use of FETCH_ATTRIBUTE
glfs: Discontinue use of FETCH_ATTRIBUTE

It assumes attribute is a boolean, which is not true for hw_block_size.

Since hw_block_size is the last place we're using FETCH_ATTRIBUTE, remove
it.

fixes #49

Signed-off-by: Andy Grover <b7d524d2f5cc5aebadb6b92b08d3ab26911cde33@redhat.com>

JefferyHu/tcmu-runner,liuy/tcmu-runner,agrover/tcmu-runner,yasker/tcmu-runner,lxbsz/tcmu-runner,open-iscsi/tcmu-runner,open-iscsi/tcmu-runner,superlibj/tcmu-runner