qemu: Rename qemuMigrationSrcCleanup
qemu: Rename qemuMigrationSrcCleanup

The function is now called qemuMigrationAnyConnectionClosed to make it
clear it is supposed to handle broken connection during migration. It
will soon be used on both sides of migration so the "Src" part was changed
to "Any" to avoid renaming the function twice in a row.

The original *Cleanup name could easily be confused with cleanup
callbacks called when a domain is destroyed.

Signed-off-by: Jiri Denemark <62bdf77dc47919a4d59a91822129d14633cfca81@redhat.com>
Reviewed-by: Peter Krempa <2cf5c04c61aa466e4a47bfedc747d17279c72ffc@redhat.com>
Reviewed-by: Pavel Hrdina <d4772d05997b8abf035041e3b4f4996380ea7e7a@redhat.com>

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