Only return share host for admins using shares API

Also, allow filtering by host based on policy 'list_by_host' that
defaults to 'admin only'.

Do not bump API, because it is not considered as expected behavior,
hence should not be kept for old microversions.

Co-Authored-By: Valeriy Ponomaryov <vponomaryov@mirantis.com>
APIImpact
Change-Id: I799bb7378927b6c3ee0f9fe88fd9876a03dd85b5
Closes bug: 1664370
7 files changed
tree: aa0b2b64f2d88189d8e04cea63e613dcf4c680fb
  1. manila_tempest_tests/