Add mountable snapshots support

This new feature gives the user the ability to allow and
deny access to the snapshots, so that they could be mounted in
read-only mode to retrieve files.

APIImpact
DocImpact

Co-Authored-By: Rodrigo Barbieri <rodrigo.barbieri@fit-tecnologia.org.br>
Co-Authored-By: Alyson Rosa <alyson.rosa@fit-tecnologia.org.br>
Co-Authored-By: Miriam Yumi <miriam.peixoto@fit-tecnologia.org.br>

Partially-implements: blueprint manila-mountable-snapshots
Change-Id: I65f398a05f82eef31ec317d70dfa101483b44b30
7 files changed
tree: 85072eb32f365833dc4b51bef57163001d11bb00
  1. manila_tempest_tests/