Fixed the nagging 404 errors in the unit test.

Make the nagging 404 errors in VolumeViewTests go away.

Closes-Bug: #1367383

Change-Id: Ib3e182b6b30bcb75a82235c845af6e72801fdb21
Enable host aggregate metadata update

Nova currently expose an api to let the users update
the host aggregates metadata so horizon should expose
this functionality. At the same time Glance is exposing
a metadata dictionary in Juno, where users can register
the key/value pairs that describe their cloud deployment.

This patch uses the glance metadata api to expose the available
metadata and the nova api to update the aggregates metadata

Co-Authored-By: Santiago Baldassin <santiago.b.baldassin@intel.com>
Co-Authored-By: Pawel Skowron <pawel.skowron@intel.com>
Co-Authored-By: Bartosz Fic <bartosz.fic@intel.com>
Co-Authored-By: Michal Dulko <michal.dulko@intel.com>
Co-Authored-By: Pawel Koniszewski <pawel.koniszewski@intel.com>
DocImpact
Change-Id: I4abf88426f548c47a21920169f710d3310e3ede6
Implements: blueprint host-aggregate-update-metadata
Stop using intersphinx

Remove intersphinx from the docs build as it triggers network calls that
occasionally fail, and we don't really use intersphinx (links other
sphinx documents out on the internet)

This also removes the requirement for internet access during docs build.

This causes docs jobs to fail because we error out on warnings.

Change-Id: I71e941e2a639641a662a163c682eb86d51de42fb
Related-Bug: #1368910
Enable flavors metadata update

Nova currently expose an api to let the users update
the flavors metadata so horizon should expose
this functionality. At the same time Glance is exposing
a metadata dictionary in Juno, where users can register
the key/value pairs that describe their cloud deployment.
This patch uses the glance metadata api to expose the available
metadata and the nova api to update the aggregates metadata.

Implements: blueprint glaance-metadata-flavors

Co-Authored-By: Santiago Baldassin <santiago.b.baldassin@intel.com>
Co-Authored-By: Pawel Skowron <pawel.skowron@intel.com>
Co-Authored-By: Pawel Koniszewski <pawel.koniszewski@intel.com>
Co-Authored-By: Michal Dulko <michal.dulko@intel.com>

DocImpact:
    New UI. FLAVOR_EXTRA_KEYS setting deprecated.

Change-Id: Ica9d3d06314a4d5afa77f644bd1f8900a1c328f7
Merge "Enable host aggregate metadata update"
Merge "Fixed the nagging 404 errors in the unit test."
Merge "Stop using intersphinx"
Merge branch 'master' of https://github.com/openstack/horizon