We may rewrite these using mock per issue 15749.

Patch by Chris Jerdonek.

Patch by Chris Jerdonek.

Patch by Jeff McNeil.

Patch by Jeff McNeil.

Instead of requiring the tester to manually add the path to the python-gdb.py
file in the checkout to their .gdbinit file, add it automatically when
invoking gdb in the test.

Instead of requiring the tester to manually add the path to the python-gdb.py
file in the checkout to their .gdbinit file, add it automatically when
invoking gdb in the test.

Patch by Janne Karila.

Patch by Berker Peksag.

Patch by Marek Šuppa.