Select Cloud Network, Security Group, IP based on tenant

https://bugzilla.redhat.com/show_bug.cgi?id=1142487

Added support to filter the above configuration items
based on the selected tenant for Openstack. If the tenant is not
selected or not available it will use the EMS to do the filtering.
Default method to convert CI elements to MiqHashStruct

https://bugzilla.redhat.com/show_bug.cgi?id=1142487

Add a new default method which can be used by basic CI objects
that dont need extra parameters to be sent to the UI
Merge pull request #660 from mkanoor/bugzilla_1142487

Openstack cloud network, security group, floating IP filtering based on selected tenant