Bug 1957551

Description of problem:

First of all this is a known issue, raising this bug to track it as I cannot find any.

After talking to Liran, smarter CPU pinning will be introduced with BZ1782077. 
But until then the user may shoot himself in the foot in a specific scenario.

The main issue here is that the default setting of HP VMs that are pinned to a host is 'Existing'.
The user may get in trouble without even knowing it as the VMs will be pinned to the same pCPUs without the user knowing.

Keep in mind users may have High Performance VMs that may may be pinned to 1+ hosts to other reasons and have no manual 
CPU pinning specified.

1. Create High Performance VM, pinned to Host
   Virtual Machines -> New
                       System -> Total Virtual CPUs = 4
                       Host -> Specific Host = Host4
                       Optimized For = High Performance
                       -> OK

2. The result is:

engine=# select vm_name,cpu_pinning from vm_static where vm_name like 'VM%';
 vm_name |   cpu_pinning   
---------+-----------------
 VM1     | 0#1_1#2_2#3_3#4
(1 row)

3. Create a new VM the same way, on the same host, like done on [1].

engine=# select vm_name,cpu_pinning from vm_static where vm_name like 'VM%';
 vm_name |   cpu_pinning   
---------+-----------------
 VM1     | 0#1_1#2_2#3_3#4
 VM2     | 0#1_1#2_2#3_3#4

4. Create 2 more VMs..

engine=# select vm_name,cpu_pinning from vm_static where vm_name like 'VM%' order by vm_name;
 vm_name |   cpu_pinning   
---------+-----------------
 VM1     | 0#1_1#2_2#3_3#4
 VM2     | 0#1_1#2_2#3_3#4
 VM3     | 0#1_1#2_2#3_3#4
 VM4     | 0#1_1#2_2#3_3#4


Version-Release number of selected component (if applicable):
rhvm-4.4.6.6-0.10.el8ev.noarch

How reproducible:
Always

Steps to Reproduce:
As above

Actual results:
- User not aware VMs pinned to the same pCPU.
- Potential for low performance on VMs that is actually High performance type.

Expected results:
- Block, Warn, keep HP VM default to 'Do not Change' or do something else until smarter pinning is available.