Remove unused imports

[Rongze Zhu]

Removed unused imports found by:
find . -type f -name "*py" -exec pylint -r n {} \; | grep -E "Unused imp|^\*"

************* Module volume.storwize_svc
W: 52,0: Unused import utils
************* Module volume.netapp
W: 26,0: Unused import string
************* Module virt.configdrive
W: 26,0: Unused import instance_metadata
W: 20,0: Unused import base64
W: 21,0: Unused import json
************* Module virt.driver
W: 25,0: Unused import power_state
************* Module virt.libvirt.utils
W: 25,0: Unused import random
************* Module virt.fake
W: 32,0: Unused import utils
************* Module virt.xenapi.vmops
W: 45,0: Unused import driver
************* Module network.nova_ipam_lib
W: 19,0: Unused import exception
************* Module crypto
W: 27,0: Unused import base64
************* Module db.sqlalchemy.migrate_repo.versions.107_add_instance_id_mappings
W: 19,0: Unused import Index
************* Module db.sqlalchemy.migrate_repo.versions.108_task_log
W: 18,0: Unused import Index
************* Module db.sqlalchemy.migrate_repo.versions.105_instance_info_caches_uses_uuid
W: 19,0: Unused import ForeignKey
W: 19,0: Unused import Column
W: 19,0: Unused import Integer
W: 19,0: Unused import select
W: 20,0: Unused import String
************* Module db.sqlalchemy.migrate_repo.versions.109_drop_dns_domains_project_id_fkey
W: 20,0: Unused import ForeignKey
W: 20,0: Unused import Column
W: 20,0: Unused import Integer
************* Module db.sqlalchemy.migrate_repo.versions.106_add_foreign_keys
W: 19,0: Unused import ForeignKey
W: 19,0: Unused import Column
W: 19,0: Unused import Integer
W: 19,0: Unused import select
W: 20,0: Unused import String
************* Module openstack.common.plugin.pluginmanager
W: 16,0: Unused import imp
W: 17,0: Unused import os
************* Module openstack.common.rpc.common
W: 25,0: Unused import cfg
W: 22,0: Unused import sys
************* Module openstack.common.notifier.api
W: 16,0: Unused import inspect
************* Module scheduler.filters.aggregate_instance_extra_specs
W: 18,0: Unused import exception
W: 21,0: Unused import utils
************* Module utils
W: 38,0: Unused import threading
W: 44,0: Unused import corolocal
************* Module tests.test_configdrive2
W: 21,0: Unused import subprocess
************* Module tests.test_xensm
W: 28,0: Unused import xenapi_conn
W: 30,0: Unused import volume_utils
W: 26,0: Unused import test
W: 19,0: Unused import os
************* Module tests.test_utils
W: 29,0: Unused import iso8601
W: 22,0: Unused import shutil
W: 23,0: Unused import socket
************* Module tests.test_plugin_api_extensions
W: 18,0: Unused import nova
W: 22,0: Unused import pluginmanager
************* Module tests.api.ec2.test_ec2_validate
W: 25,0: Unused import importutils
************* Module tests.api.openstack.compute.contrib.test_hosts
W: 24,0: Unused import exception
************* Module tests.api.openstack.compute.contrib.test_instance_usage_audit_log
W: 23,0: Unused import exception
W: 17,0: Unused import exc
W: 20,0: Unused import compute_utils
************* Module tests.network.test_api
W: 21,0: Unused import db
************* Module tests.test_storwize_svc
W: 34,0: Unused import utils
************* Module tests.test_libvirt
W: 35,0: Unused import compute_utils
W: 34,0: Unused import compute_rpcapi
************* Module tests.test_service
W: 25,0: Unused import greenthread
************* Module tests.scheduler.test_host_manager
W: 19,0: Unused import datetime
************* Module tests.scheduler.test_scheduler
W: 34,0: Unused import rpc_common

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/11491

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/11491
Committed: http://github.com/openstack/nova/commit/55a21ce5e8b0612591396dfba84c2f0520ffaba1
Submitter: Jenkins
Branch: master

commit 55a21ce5e8b0612591396dfba84c2f0520ffaba1
Author: RongzeZhu <email address hidden>
Date: Fri Aug 17 02:40:50 2012 +0800

    Remove unused imports

    Fixes bug #1037705

    Change-Id: I3e55f283961b4801c863bea05d9dd36e22be0cdb