OpalGard: Fix python3 float type error
OpalGard: Fix python3 float type error

Properly use floor/integer division.

Traceback (most recent call last):
  File "testcases/OpalGard.py", line 95, in runTest
    offset = hex(int(data["offset"])/16)
TypeError: 'float' object cannot be interpreted as an integer

Signed-off-by: Deb McLemore <1938e6bc52a6fb400ff401d42bc5360c2c7aaa30@linux.ibm.com>

open-power/op-test-framework,open-power/op-test-framework,open-power/op-test-framework