title: Database-first EF7-7.0.0-rc1-final dnx ef dbcontext scaffold command fails
body: <p>I am using this command:</p>
  
  <pre><code>dnx ef dbcontext scaffold "Server=webuat08,1433,Database=Store;user    
  id=user_here;password=password_here" EntityFramework.MicrosoftSqlServer
  </code></pre>
  
  <p>The database "Store" exists. But I am getting the following error:</p>
  
  <pre><code>Unable to identify the primary key for table 'dbo.spt_fallback_db'.
  Unable to generate entity type for table 'dbo.spt_fallback_db'.
  Unable to identify the primary key for table 'dbo.spt_fallback_dev'.
  Unable to generate entity type for table 'dbo.spt_fallback_dev'.
  Unable to identify the primary key for table 'dbo.spt_fallback_usg'.
  Unable to generate entity type for table 'dbo.spt_fallback_usg'.
  Could not find type mapping for column 
  'dbo.MSreplication_options.optname'     with data type 'sysname'. Skipping column.
  Unable to identify the primary key for table 'dbo.MSreplication_options'.
  Unable to generate entity type for table 'dbo.MSreplication_options'.
  Unable to identify the primary key for table 'dbo.spt_monitor'.
  Unable to generate entity type for table 'dbo.spt_monitor'.
  Done
  </code></pre>
  
  <p>If I change the name of the Database in the command to a DB that doesn't exist I still get the same error.  Any ideas?</p>