Ability to create multiple volumes at the same time

The goal of the blueprint is to allow the creation of more volumes at the same time (of sequentially) from the cinder create command. The idea is the same as nova, thus a new option (new parameter of 'create') should be added like so:

$ cinder create --num-volumes 3 --display-name volume <size>

e.g.

$cinder create --num-volumes 2 --display-name testvolume 1

+-------------------+--------------------------------------+
| Property | Value |
+-------------------+--------------------------------------+
| attachments | [] |
| availability_zone | nova |
| bootable | false |
| created_at | 2014-01-23T16:31:48.267289 |
| description | None |
| id | 78234f50-cdd1-4eb1-a4cb-51fdd62655b0 |
| metadata | {} |
| name | testvolume-1 |
| size | 1 |
| snapshot_id | None |
| source_volid | None |
| status | creating |
| user_id | c1d40fde5dbf4c11ada67cae1f009833 |
| volume_type | None |
+-------------------+--------------------------------------+

+-------------------+--------------------------------------+
| Property | Value |
+-------------------+--------------------------------------+
| attachments | [] |
| availability_zone | nova |
| bootable | false |
| created_at | 2014-01-23T16:31:48.267289 |
| description | None |
| id | 88445533-cdd1-4eb1-a4cb-51fdd62655b0 |
| metadata | {} |
| name | testvolume-2 |
| size | 1 |
| snapshot_id | None |
| source_volid | None |
| status | creating |
| user_id | c1d40fde5dbf4c11ada67cae1f009833 |
| volume_type | None |
+-------------------+--------------------------------------+

$ cinder create --num-volumes 2 1
+-------------------+--------------------------------------+
| Property | Value |
+-------------------+--------------------------------------+
| attachments | [] |
| availability_zone | nova |
| bootable | false |
| created_at | 2014-01-23T16:31:48.267289 |
| description | None |
| id | 78234f50-cdd1-4eb1-a4cb-51fdd62655b0 |
| metadata | {} |
| name | None |
| size | 1 |
| snapshot_id | None |
| source_volid | None |
| status | creating |
| user_id | c1d40fde5dbf4c11ada67cae1f009833 |
| volume_type | None |
+-------------------+--------------------------------------+

+-------------------+--------------------------------------+
| Property | Value |
+-------------------+--------------------------------------+
| attachments | [] |
| availability_zone | nova |
| bootable | false |
| created_at | 2014-01-23T16:31:48.267289 |
| description | None |
| id | 88445533-cdd1-4eb1-a4cb-51fdd62655b0 |
| metadata | {} |
| name | None |
| size | 1 |
| snapshot_id | None |
| source_volid | None |
| status | creating |
| user_id | c1d40fde5dbf4c11ada67cae1f009833 |
| volume_type | None |
+-------------------+--------------------------------------+

Additional formatting parameter added in the cinderclient --summarize which will display the condensed output for multiple volume creation.

e.g.

$ cinder create --num-volumes 2 --summarize true --display-name test2 1
+--------------------------------------+-----------+------+------+-------------+----------+-------------+
| ID | Status | Name | Size | Volume Type | Bootable | Attached to |
+--------------------------------------+-----------+------+------+-------------+----------+-------------+
| 78234f50-cdd1-4eb1-a4cb-51fdd62655b0 | available | test2-1 | 1 | None | false | |
+--------------------------------------+-----------+------+------+-------------+----------+-------------+
| 88776644-cdd1-4eb1-a4cb-51fdd62655b0 | available | test2-2 | 1 | None | false | |
+--------------------------------------+-----------+------+------+-------------+----------+-------------+

This will also need additional input parameters on dashboard for number of volumes.