Provide filter name in user messages

Filtering issues are most common when creating a share. User messages
now keep information which was the last executed filter if hosts
filtering failed.

DocImpact
Partially-implements: blueprint user-messages

Change-Id: I9ce096eebda3249687268e361b7141dea4032b57
1 file changed
tree: 6224143756ad5127f0659950d5d8a0084f545360
  1. manila_tempest_tests/