[INC] In function 'ib_get_attr_offset()' replace attr_size adjustment code with an...

[INC] In function 'ib_get_attr_offset()' replace attr_size adjustment code with an ASSERT() as attr offset sizes are required to be a multiple of 8 bytes.

By removing antiquated structure padding, the sizeof(struct) values return to the correct size alignment.
Removal of padding allows osmtest to correctly generate and validate a fabric inventory file.

signed-off-by: stan smith <stan.smith@intel.com>

git-svn-id: svn://openib.tc.cornell.edu/gen1@2798 ad392aa1-c5ef-ae45-8dd8-e69d62a5ef86