[NC] Rename key-generation script for migration credentials.

Implements EUCA-5098.
Maintenance-mode development.

- [CC] Roughing in generation and passing of credentials for migrations.
- Updated copyright dates.

Implements EUCA-5097.
Maintenance-mode development.

[NC] Roughing in automatic handling of credentials for migrations.

Implements EUCA-5098.
Maintenance-mode development.

- [NC] Automatic generation of migration credentials implemented on source nodes.

Implements EUCA-5098.
Maintenance-mode development.

- [NC] Automatic generation of migration credentials implemented on destination nodes.

Implements EUCA-5098.
Maintenance-mode development.

- [NC] Checkpoint commit on script to handle libvirtd credentials.

Implements EUCA-5096.
Maintenance-mode development.

- Initial functional version of script to grant/revoke libvirtd credentials on KVM NCs.
- Add script (libvirtd-auth.pl) to tools/Makefile.

Implements EUCA-5096, EUCA-5098.
Maintenance-mode development.

- Renamed libvirtd-auth.pl to authorize-migration-keys.pl.
- [NC] Initial functional version of granting/revocation of libvirtd credentials.

Implements EUCA-5098, EUCA-5096.
Merge remote-tracking branch 'origin/testing' into dev/juphoff/evac-test
Maintenance-mode development.

- [CC] Temporarily use timestamp for migration shared secret.

Implements EUCA-5097.
Maintenance-mode development.

- Move migration-key scripts from $EUCALYPTUS/usr/sbin to $EUCALYPTUS/usr/share/eucalyptus

Implements EUCA-5096.