Drop large-ops-testing number to 100 from 175

175 is hitting issues with ceilometer, we want to see if we 100 will
work with ceilometer.

Change-Id: Icdc3dd8813486fb00891e63d62f59b89d8d6227a
Note: large-ops currently uses 50 for its number.
Merge "Drop large-ops-testing number to 100 from 175"