Remove aggressive assert from share server test

The delete_share_server test has an assert which can
fail in case of retries and give a false negative result.
This assert isn't necessary to check for correctness, so
remove it.

Closes-bug: 1546618

Change-Id: Ib04afdc222e19725df4da0793c1ffcc15282a772
1 file changed
tree: 0942b7bd32d735f3d2c45ccbb21a2975aeab709b
  1. manila_tempest_tests/