TST: mark test_gdb_info as xfail (#149)

This test makes many assumptions specific to our deployment.
In general, it's hard to tell if the configuration is correct,
so for now it is more practical to mark it as xfail.

whatrecord/tests/test_gdb_integration.py

@@ -29,6 +29,7 @@
 )
 
 
+@pytest.mark.xfail(reason="Makes too many SLAC/LCLS/PCDS/ECS assumptions.")
 @platform_skip
 @gdb_unavailable_skip
 @softioc_unavailable_skip