Edited Issue: EntityContainer is in a different namespace than EntityType [1579]

By default, in webapi.odata (from v3), EntityContainer is in a different namespace than EntityType. Consider make them in the same namespace by default.
```
<?xml version="1.0" encoding="utf-8"?>
<edmx:Edmx Version="1.0"
xmlns:edmx="http://schemas.microsoft.com/ado/2007/06/edmx">
<edmx:DataServices m:DataServiceVersion="3.0" m:MaxDataServiceVersion="3.0"
xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata">
<Schema Namespace="WebApplication3.Models"
xmlns="http://schemas.microsoft.com/ado/2009/11/edm">
<EntityType Name="Product">
<Key>
<PropertyRef Name="ID" />
</Key>
<Property Name="ID" Type="Edm.Int32" Nullable="false" />
<Property Name="Name" Type="Edm.String" />
</EntityType>
<EntityType Name="Customer">
<Key>
<PropertyRef Name="ID" />
</Key>
<Property Name="ID" Type="Edm.Int32" Nullable="false" />
<Property Name="Name" Type="Edm.String" />
</EntityType>
</Schema>
<Schema Namespace="Default"
xmlns="http://schemas.microsoft.com/ado/2009/11/edm">
<EntityContainer Name="Container" m:IsDefaultEntityContainer="true">
<EntitySet Name="Products" EntityType="WebApplication3.Models.Product" />
<EntitySet Name="Customers" EntityType="WebApplication3.Models.Customer" />
</EntityContainer>
</Schema>
</edmx:DataServices>
</edmx:Edmx>
```