domain: Add case for domain APIs(II)

Test scripts for testing below APIs/flags:

275-open-graphics-fd.t:

• $dom->open_graphics_fd()

302-migration-compche.t:

• dom->migrate_get_compression_cache
• dom->migrate_set_compression_cache

305-migration-max-downtime.t:

• $dom->migrate_get_max_downtime()
• $dom->migrate_set_max_downtime()

500-metadata.t:

• $dom->get_metadata()
• Sys::Virt::Domain::METADATA_TITLE
• Sys::Virt::Domain::METADATA_DESCRIPTION

700-core-dump.t:

• $dom->core_dump_formats
• Sys::Virt::Domain::CORE_DUMP_FORMAT_RAW
• Sys::Virt::Domain::CORE_DUMP_FORMAT_KDUMP_ZLIB
• Sys::Virt::Domain::CORE_DUMP_FORMAT_KDUMP_SNAPPY
• Sys::Virt::Domain::CORE_DUMP_FORMAT_KDUMP_LZO
• Sys::Virt::Domain::JOB_OPERATION_DUMP
• Sys::Virt::Domain::JOB_MEMORY_PAGE_SIZE

900-get-version.t:

• $vmm->get_version()
• $vmm->get_major_version
• $vmm->get_minor_version
• $vmm->get_micro_version
• $vmm->get_library_version

Signed-off-by: Dan Zheng dzheng@redhat.com