Show hypervisor type in 'nova hypervisor-list'

Registered by Yang Hongyang

Currently 'nova hypervisor-list' do not contain hypervisor type which is useful when there's multiple hypervisors within a cloud.
Current:
$ nova hypervisor-list
+----+---------------------+-------+---------+
| ID | Hypervisor hostname | State | Status |
+----+---------------------+-------+---------+
| 1 | yanghy-devstack | up | enabled |
+----+---------------------+-------+---------+
Expected:
$ nova hypervisor-list
+----+---------------------+-----------------+-------+---------+
| ID | Hypervisor hostname | Hypervisor type | State | Status |
+----+---------------------+-----------------+-------+---------+
| 1 | yanghy-devstack | QEMU | up | enabled |
+----+---------------------+-----------------+-------+---------+

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
Yang Hongyang
Direction:
Needs approval
Assignee:
Yang Hongyang
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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