migration: Update postcopy case

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Add new step to check virtqemud log.

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Test result:

(1/4) type_specific.io-github-autotest-libvirt.migration.memory_copy_mode.postcopy.default_postcopy.p2p: STARTED (1/4) type_specific.io-github-autotest-libvirt.migration.memory_copy_mode.postcopy.default_postcopy.p2p: PASS (309.23 s) (2/4) type_specific.io-github-autotest-libvirt.migration.memory_copy_mode.postcopy.migrate_postcopy.p2p: STARTED (2/4) type_specific.io-github-autotest-libvirt.migration.memory_copy_mode.postcopy.migrate_postcopy.p2p: PASS (273.33 s) (3/4) type_specific.io-github-autotest-libvirt.migration.memory_copy_mode.postcopy.postcopy_after_precopy.p2p: STARTED (3/4) type_specific.io-github-autotest-libvirt.migration.memory_copy_mode.postcopy.postcopy_after_precopy.p2p: PASS (386.23 s) (4/4) type_specific.io-github-autotest-libvirt.migration.memory_copy_mode.postcopy.timeout_postcopy.p2p: STARTED (4/4) type_specific.io-github-autotest-libvirt.migration.memory_copy_mode.postcopy.timeout_postcopy.p2p: PASS (273.73 s)

(1/2) type_specific.io-github-autotest-libvirt.migration.memory_copy_mode.precopy.p2p: STARTED (1/2) type_specific.io-github-autotest-libvirt.migration.memory_copy_mode.precopy.p2p: PASS (320.52 s) (2/2) type_specific.io-github-autotest-libvirt.migration.memory_copy_mode.precopy.non_p2p: STARTED (2/2) type_specific.io-github-autotest-libvirt.migration.memory_copy_mode.precopy.non_p2p: PASS (285.26 s)

[Yingshun]

Case pattern changed, plz update case mapping in caselink and ci, thx!

[cliping]

Case pattern changed, plz update case mapping in caselink and ci, thx!

Thanks Yingshun for your reminder. I have updated caselink and ci. Thanks.