Support specifying vCPU bands to pCPU

Registered by Brin Zhang

Support server vCPU binding to the specified pCPU, such as vCPU0-->pCPU0; vCPU1-->pCPU1.
e.g.
| +------+ | +------+ | +------+ | +------+ |
| |pCPU0 | | |pCPU1 | | |pCPU2 | | |pCPU3 | |
| +------+ | +------+ | +------+ | +------+ |
| | | | | |
| | | | | |
| +------+ | +------+ | +------+ | +------+ |
| |vCPU0 | | |vCPU1 | | |vCPU2 | | |vCPU3 | |
| +------+ | +------+ | +------+ | +------+ |

Blueprint information

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

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sean-k-mooney: this proposal has been explictly reject multiple times in the past and will never be supported by nova. openstack is a infrastructure cloud platform and nova provides an abstration over the compute context used to exectue your application. this would require expose host and hypervior level infomation with violate the cloud absrtation and is not inline with the nova technical vision reflection
https://review.opendev.org/#/c/658932/3/doc/source/contributor/vision-reflection.rst

brinzhang: sean-k-mooney said is true, this may will undermine the architecture of nova, and it will require in-depth research and careful consideration.

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