Add testcase for database operations in guest_register.
Add testcase for database operations in guest_register.

Includes test_add_guest_migrated, test_switch_add_record_migrated.

Change-Id: I1d54bb6c51afac97c3fef39c56449967613436f7

mfcloud/python-zvm-sdk,mfcloud/python-zvm-sdk,mfcloud/python-zvm-sdk,mfcloud/python-zvm-sdk