python: Add tests for record Python bindings

Signed-off-by: Tim Wiederhake <tim.wiederhake@intel.com>

gdb/testsuite/ChangeLog:

        * gdb.python/py-record-btrace.c, gdb.python/py-record-btrace.exp,
	gdb.python/py-record-full.c, gdb.python/py-record-full.exp: New file.

Change-Id: Icd919b4e1d5642f5cbc097a6aede1416eba402e5