Remove aggregate_get_by_host() from conductor API

The aggregate_get_by_host() method of the conductor API is no longer
used.  Remove it from the client code and leave a note on the manager
side for it to be removed in the next major version bump.

This is cleanup, but part of a blueprint being completed during
feature freeze.  It allows us to drop more code in the rpc version
bump.

Part of blueprint rpc-major-version-updates-icehouse

Change-Id: Ib28fab80adbe796ecaded040d4c33ea05659e509
Remove instance_get() from conductor API

The instance_get() method of the conductor API is no longer
used.  Remove it from the client code and leave a note on the manager
side for it to be removed in the next major version bump.

This is cleanup, but part of a blueprint being completed during
feature freeze.  It allows us to drop more code in the rpc version
bump.

Part of blueprint rpc-major-version-updates-icehouse

Change-Id: Id2ed674c2d4c491bc7b0b0c79a64bef84fb05db4
Remove migration_update() from conductor API

The migration_update() method of the conductor API is no longer
used.  Remove it from the client code and leave a note on the manager
side for it to be removed in the next major version bump.

This is cleanup, but part of a blueprint being completed during
feature freeze.  It allows us to drop more code in the rpc version
bump.

Part of blueprint rpc-major-version-updates-icehouse

Change-Id: Id385255cbfff8c7a42a9a1551044746b7f6344bd
Remove block_device_mapping_destroy() from conductor API

The block_device_mapping_destroy() method of the conductor API is no
longer used.  Remove it from the client code and leave a note on the
manager side for it to be removed in the next major version bump.

This is cleanup, but part of a blueprint being completed during
feature freeze.  It allows us to drop more code in the rpc version
bump.

Part of blueprint rpc-major-version-updates-icehouse

Change-Id: Iffdb6f77cd611918ca27f64162c1b4f13a46815b
Merge "Remove aggregate_get_by_host() from conductor API"
Merge "Remove instance_get() from conductor API"
Merge "Remove migration_update() from conductor API"
Merge "Remove block_device_mapping_destroy() from conductor API"