[Migration] Adjust most scenarios with --p2p --tunnelled migration

[dzhengfy]

There is a requirement that --p2p --tunnelled migration has higher priority. So we plan add the two options to existing cases as much as possible.

[balamuruhans]

@dzhengfy this scenario is available in virsh.migrate, can we use the same or is there different thoughts on it ?

tp-libvirt/libvirt/tests/cfg/virsh_cmd/domain/virsh_migrate.cfg

Lines 255 to 261 in fb8ff81

	- there_p2p:
	# Uni-direction migration with option --p2p.
	virsh_migrate_options = "--live --p2p"
	- there_p2p_tunnelled:
	# Uni-direction migration with option --tunnelled.
	# --tunnelled should be used with --p2p.
	virsh_migrate_options = "--live --p2p --tunnelled"

[dzhengfy]

@balamuruhans , the purpose is to add '--p2p --tunnelled' to much more existing scenarios. Most existing scenarios should be able to work with this two options, however we need adjust some of them if need.

[balamuruhans]

@dzhengfy Agree with you. Thanks