Description:
The current error information for duplicate key lists
the key value and key name. In some scenarios this
may not be sufficient.

Solution:
Add the tablename for the key into the error message.

Changed the contribution patch, as guidelines
urges us not to implement any new options.
The extended error information on the duplicate key is now
default. Due to internal policy it was not fitting to
include the query text as part of the error message.
A lot of tests was re recorded and changed.

Many thanks to Facebook for this idea.

Change-Id: Iaa1305e2732415a1c197b262160b0d91af11936d