Currently, when ones run the module in check_mode it tries to retrieve
values from the actual certificate generated in the generate() function.
Since in check_mode we call dump() without calling generate(), self.cert
is None, leading to self.cert.get_notBefore(), self.cert.get_notAfter()
and self.cert.get_serial_number() raising an error.
> NoneType' object has no attribute 'get_notBefore'
The solution is to have two way to handle dump() method, whether its run
in check_mode=True or check_mode=False leading to different way the
information is retrieved.
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