[Tempest] Make share size configurable in scenario tests

The scenario tests missing a way to configure
the share size created during the test.

Change-Id: I58d433a39037cbdb4ad92f956cfc27c54739fe1a
Closes-bug: #1642548
1 file changed
tree: 4e997be27d9cc83d4f99860e68b211cece89c302
  1. manila_tempest_tests/