fix CI by excluding GC3Pie 2.6.7 (which is broken with Python 2) and improve error reporting for option parsing #3798
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GC3Pie 2.6.7 has a bug which makes it fail to import on Python2 fixed with gc3pie/gc3pie@db82754
Also our error reporting doesn't really help to find this as it just says:
Failed to parse configuration options: invalid syntax (__init__.py, line 2159)
which isn't exactly helpfulHence only catch our error