[Migration] Add case for live migration(precopy + postcopy) with various cpu/memory configurations

[dzhengfy]

Add below configurations, do migration， check the configuration consistency on both hosts. Existing cases may already have some of below configurations, so we need to find the gap and make the implementation plan.

Such as:

• vcpu
• vcpus
• cpuset
• vcpupin
• cputune
• emulatorpin cpuset
• cpu numa
• cpu mode
• numatune
• maxMemory
• memoryBacking
• memtune
• memory device
• memballoon
• memAccess

[balamuruhans]

@dzhengfy below scenarios are new stuff to be implemented,

• memory device
• memballoon
• memAccess

we can plan these scenarios to be covered as part of #1639

• vcpu
• vcpus
• cpuset
• vcpupin
• cputune
• emulatorpin cpuset

We have the below scenarios already covered in virsh.migrate,

• cpu numa
• cpu mode
• numatune
• maxMemory
• memoryBacking
• memtune

[dzhengfy]

@balamuruhans , thanks for your feedback. Would you like to also cover the first three (memory device/memballoon/memAccess)?