OData Importing issues

After fixing the TEIID-2673, I have failed to import the OData metadata correctly. Upon some investigation here are some issues that needs to be fixed on the Designer

1) MED specified for OData properties are incomplete. Please add following properties

Namespace URI:http://www.jboss.org/teiiddesigner/ext/odata/2012
Namespace: teiid_odata

1. LinkTables - String/optional
2. HttpMethod - String/optional
3. JoinColumn - String/optional
4. EntityType - String/optional
5. ComplexType - String/optional
6. ColumnGroup - String/optional

2) When the "name space" based properties are returned in the DDL from Teiid, none of the properties are correctly being resolved. Bigger issue is they are being ignored, Designer should fail here with error message saying that "extension property match not found" and force users to define or select a MED that matches with all the properties

3) Mark the OData not built-in, so that it allows the user to edit the allowed properties list until we have the feature fully worked as expected.