When the Glance "multihash" is available on an image, the
glanceclient should use it instead of MD5 to validate data
downloads.  For cases in which the multihash specifies an
algorithm not available to the client, an option is added
to the image-download command that will allow fallback to
the legacy MD5 checksum verification.

Change-Id: I4ee6e5071eca08d3bbedceda2acc170e7ed21a6b
Closes-bug: #1788323
(cherry picked from commit 8fd7e8c664e82d805dc4a12534b3d7e3fcaac606)

If the token is encoded by base64, it may contain '=' char
as well.

We should skip quoting it.

Change-Id: I1ca63d251fa366f0e8e58128d45b729a2489b65c
Partial-Bug: #1783290
(cherry picked from commit eba4bb06d9aeaaf18a7e393ae8c03d47bd052f20)

Added --hidden argument to list, create and
update call.

Related to blueprint hidden-images
Change-Id: I1f2dcaa545c9da883186b20a96a70c7df994b994

The token in request header may contain url char, such as '+',
if quote it, '+' will change to '%2B' which will lead to 401 error.

Our CI doesn't notice this bug because Keystone use fernet token
which doesn't contain url char by default. But token format in
keystone is plugable, some out-tree token formats may contain
url char (for example, PKI/PKIZ token).

So we should skip quote token to avoiding information changing.

Closes-bug: #1783290
Change-Id: I5aa71b3e2b9b19581e46ccf8a80eda5d637f17d1

Related to blueprint multi-store

Change-Id: Ib22cc5fd4eee0326c307abb236ef31a39edfa6a6

Added multi-store support. User can now use '--backend'
option to pass desired store while creating, uploading or
importing image to speific store backend.

Added new command 'stores-info' which will return available
stores information to the user.

Related to blueprint multi-store
Change-Id: I7370094fc4ed47205b5a86a18b22aaa7b9457e5b