Add Mitaka-1 release notes

This adds release notes for changes up to the Mitaka-1
milestone for reno release note generation.

Change-Id: I8cd65b41994631d96c5d4cf4c0531a3c0f74149f

releasenotes/notes/backup_driver_init_state-d4834fa927e502ab.yaml

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+---
+fixes:
+  - Fixed service state reporting when backup manager is unable to initialize one of the backup drivers.

releasenotes/notes/cg-scheduler-change-180a36b77e8cc26b.yaml

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+---
+fixes:
+  - Consistency group creation previously schedules at the pool level. Now it is fixed to schedule at the backend level as designed.

releasenotes/notes/cg_api_volume_type-7db1856776e707c7.yaml

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+---
+features:
+  - The consistency group API now returns volume type IDs.

releasenotes/notes/cloudbyte-retype-support-4b9f79f351465279.yaml

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+---
+features:
+  - Retype support added to CloudByte iSCSI driver.

releasenotes/notes/deprecate-xml-api-bf3e4079f1dc5eae.yaml

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+---
+upgrade:
+  - The XML API has been marked deprecated and will be removed in a future release.

releasenotes/notes/deprecated-ibm-multipath-f06c0e907a6301de.yaml

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+---
+upgrade:
+  - Deprecated IBM driver _multipath_enabled config flags.

releasenotes/notes/downstream_genconfig-e50791497ce87ce3.yaml

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+---
+fixes:
+  - Removed the need for deployers to run tox for config reference generation.

releasenotes/notes/enforce_min_vmware-a080055111b04692.yaml

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+---
+upgrade:
+  - VMware backend driver now enforces minimum vCenter version of 5.1.

releasenotes/notes/lefthand-consistency-groups-d73f8e418884fcc6.yaml

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+---
+features:
+  - Consistency group support has been added to the LeftHand backend driver.

releasenotes/notes/nexenta-edge-iscsi-b3f12c7a719e8b8c.yaml

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+---
+features:
+  - Added backend driver for Nexenta Edge iSCSI storage.

releasenotes/notes/nimble-manage-unmanage-1d6d5fc23cbe59a1.yaml

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+---
+features:
+  - Manage and unmanage support has been added to the Nimble backend driver.

releasenotes/notes/quota-volume-transfer-abd1f418c6c63db0.yaml

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+---
+fixes:
+  - Corrected quota usage when transferring a volume between tenants.

releasenotes/notes/rebranded-hpe-drivers-caf1dcef1afe37ba.yaml

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+---
+upgrade:
+  - HP drivers have been rebranded to HPE. Existing configurations will continue to work with the legacy name, but will need to be updated by the next release.

releasenotes/notes/remove-hp-cliq-41f47fd61e47d13f.yaml

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+---
+upgrade:
+  - The deprecated HP CLIQ proxy driver has now been removed.

releasenotes/notes/remove_storwize_npiv-b704ff2d97207666.yaml

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+---
+upgrade:
+  - Removed the deprecated NPIV options for the Storwize backend driver.

releasenotes/notes/removed-scality-7151638fdac3ed9d.yaml

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+---
+upgrade:
+  - Backend driver for Scality SRB has been removed.

releasenotes/notes/updated-at-list-0f899098f7258331.yaml

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+---
+features:
+  - The updated_at timestamp is now returned in listing detail.

releasenotes/notes/vmware-vmdk-removed-bfb04eed77b95fdf.yaml

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+---
+upgrade:
+  - The VMware VMDK backend driver has been removed.

releasenotes/notes/vnx_clone_cg-db74ee2ea71bedcb.yaml

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+---
+features:
+  - Cloning of consistency group added to EMC VNX backend driver.