Remove unused exceptions from cinder/exception.py

find cinder/ -type f -name "*pyc" -exec rm {} \;
exceptions=`cat cinder/exception.py| grep -E '^class' |\
 awk {'print $2'} | awk -F '(' {'print $1'}`
for exc in $exceptions
do
    i=`find cinder/ -type f -exec grep -R $exc {} \; |wc -l`
    if [ $i -eq 1 ]
    then
        echo $exc
    fi
done

First removed exceptions:

DecryptionFailure
ImagePaginationFailed
VirtualInterfaceCreateException
VirtualInterfaceMacAddressException
MelangeConnectionFailed
VolumeUnattached
InvalidKeypair
InvalidSignature
InvalidInstanceType
InvalidIpProtocol
InvalidCidr
InvalidAggregateAction
InvalidGroup
InstanceInvalidState
InstanceNotRunning
InstanceNotSuspended
InstanceNotInRescueMode
InstanceSuspendFailure
InstanceResumeFailure
InstanceRebootFailure
InstanceTerminationFailure
VolumeServiceUnavailable
UnableToMigrateToSelf
DestinationHostUnavailable
SourceHostUnavailable
InvalidHypervisorType
DestinationHypervisorTooOld
DestinationDiskExists
InvalidDevicePath
DeviceIsBusy
InvalidCPUInfo
InvalidIpAddressError
InvalidVLANTag
InvalidVLANPortGroup
InvalidDiskFormat
InstanceUnacceptable
FlagNotSet
NoVolumeTypesFound
VolumeDriverNotFound
ListingImageRefsNotSupported
KernelNotFoundForImage
ProjectNotFound
ProjectMembershipNotFound
UserRoleNotFound
StorageRepositoryNotFound
DatastoreNotFound
FixedIpNotFoundForAddress
FixedIpNotFoundForInstance
FixedIpNotFoundForNetworkHost
FixedIpNotFoundForSpecificInstance
FixedIpNotFoundForHost
FixedIpAlreadyInUse
FixedIpInvalid
NoMoreFixedIps
NoFixedIpsDefined
FloatingIpDNSExists
FloatingIpNotFoundForAddress
FloatingIpNotFoundForHost
NoMoreFloatingIps
FloatingIpAssociated
FloatingIpNotAssociated
NoFloatingIpsDefined
NoFloatingIpInterface
KeypairNotFound
CertificateNotFound
AuthTokenNotFound
AccessKeyNotFound
SecurityGroupNotFoundForProject
SecurityGroupNotFoundForRule
SecurityGroupExistsForInstance
SecurityGroupNotExistsForInstance
NoInstanceTypesFound
InstanceTypeNotFoundByName
FlavorNotFound
CellNotFound
SchedulerHostFilterNotFound
SchedulerCostFunctionNotFound
SchedulerWeightFlagNotFound
InstanceMetadataNotFound
InstanceTypeExtraSpecsNotFound
LDAPUserNotFound
LDAPGroupNotFound
LDAPGroupMembershipNotFound
NoFilesFound
SwitchNotFoundForNetworkAdapter
NetworkAdapterNotFound
GlobalRoleNotAllowed
ImageRotationNotAllowed
RotationRequiredForBackup
LDAPUserExists
LDAPGroupExists
LDAPMembershipExists
ProjectExists
InstanceExists
InstanceTypeExists
InvalidSharedStorage
CannotResizeToSameSize
ImageTooLarge
ZoneRequestError
InstanceTypeMemoryTooSmall
InstanceTypeDiskTooSmall
InsufficientFreeMemory
CouldNotFetchMetrics
AggregateError
AggregateNotFound
AggregateNameExists
AggregateHostNotFound
AggregateMetadataNotFound
AggregateHostConflict
AggregateHostExists
InstanceTypeCreateFailed
SolidFireAPIStatusException
DuplicateVlan
InvalidInstanceIDMalformed
CouldNotFetchImage

Search again, Second removed exceptions:

UserNotFound
FixedIpNotFoundForNetwork
FloatingIpNotFound
SecurityGroupNotFound
InstanceTypeNotFound
LDAPObjectNotFound
UserExists

Search again, Third removed exceptions:

FixedIpNotFound

Change-Id: I028122c6132340b2fef2c144da787b7c4efddccf
Add 'detaching' to volume status

Fixes bug #1004382

When attach a volume , the volume status is "available -> attaching ->
in-use", But when detaching a volume , the volume status is "in-use ->
available". So We need 'detaching' volume status, it make the change of
state of the volume more clearly.

Change-Id: Idf8c38413135bf8e8cd025f11937f8c7250557c1
Fix PEP8 issues.

Fix some pep8 issues in doc/ext/cinder_todo.py make the code looks pretty.

Change-Id: I137c8bf5af30eb54a44cbff7f1fbc35bc2c3ed9e
Remove unused return values and commented out code from NFS driver

bug 1037622

Change-Id: Idea3005ad94fd6bfc76fd0f3969ee78e3031767e
Merge "Remove unused exceptions from cinder/exception.py"
Merge "Remove unused return values and commented out code from NFS driver"
Merge "Add 'detaching' to volume status"
Merge "Fix PEP8 issues."
Spelling: Persistant=>Persistent

Change-Id: Id8e1bef634fe66e06624b5b3bcd82f59735d76e3