Updated Automate UI export to use backup with zip format.

Rewrote MiqAeDatastore unit test for new automate zip format.
Test validates more counts than previous version and skips unneeded "should_not raise_error" export test.
Testing .log_status should not blindly call .log_system_status

MiqServer.log_system_status does a lot of shelling out.
Merge pull request #163 from chessbyte/fix_miq_server_status_management_spec

Testing .log_status should not blindly call .log_system_status
Merge pull request #156 from gmcculloug/automate_ui_export

Updated Automate UI export to use backup with zip format.
Default priority for domain, set priority based on ordered domain ids
Merge pull request #158 from mkanoor/domain_properties

Default priority for domain, set priority based on ordered domain ids